darklight03/StackMIAsub huggingface dataset:
Physicists studying the foundations of physics and some mathematicians sometimes look at theories which are similar to general-relativity, but do not coincide with it. Often these theories contradict with what we know about our world. What should one do in order to check one of such theories? Which papers/books should one read in order to be able to understand mathematical theories similar to general relativity, and understand when such theory is compatible with what we know about our world?
When a Hadron and its antimatter equivalent annihilate, what happens to the QCD "soup" (for lack of an appropriate term) from each? Eg, the valence quarks in a proton - antiproton event, to they pair off and annihilate "in the moment"? What about the quark soup at progressively higher energies? How do we account for this? (for that matter, if it's relevant, why only two gamma rays, and not more?)
I have a question regarding matrices and eigen values. If SVD decomposition was performed on matrix, and the inner matrix of singular values has only one non zero value. Should the left and right singlular matrices be only a matrix of one vector? The reason I ask is that I have performed SVD on matrix in matlab using function svd, and it turns out that there is one eigen value but the right and left matrices are not one vector Thanks
I would like to find a sinusoidal wave whose period or frequency change to half (or double) with every step, someting like this But I cant find the precise coefficients for the period to decrease (or increase) twice. Can someone help me? I want to use it to map the different pitch (or notes) of voice, to certain values. In our speech, and singing, the range of the first octave is half of the next octave, so I need a function whose period is twice as big each time to cover all the octaves. it need not be a sinusoidal it can be any periodical function.
I was trying to understand why curl measures a vector field's tendency of rotation. Two examples from physics seem to answer my question: Curl of the velocity field is twice the angular velocity Curl of the force field is the torque. But I can only prove the first one when the velocity field describes a uniform circular motion. How can I show that the two examples are true in general to show that curl is really the measure of rotation.
Consider a body which can freely rotate with respect to the inertial frame, and a rotating disk whose axis is fixed in body frame. When applying the lagrangian method (does that make a difference?), is the kinetic energy of the disk with respect to the body frame (for constant disk rotation rate, the kinetic energy is constant) or with respect to inertial frame (for constant disk rotation rate, the kinetic energy depends on the rate of the parent body)? Parent discussion: Defy gravity torques with gyroscopes?
Lets take a very big rotating star ,after the finish of the nuclear fuel the star is going to contract under its own gravity.Now to conserve its angular momentum the star is going to rotate faster. But how will you explain it in terms of force without involving the concept of torque and angular momentum (Intuitively)?what forces helped to rotate the star faster? If you do not like to think about a star,think about twirling ice skater who pulls her arms? Edit:Let me add here,this is actually a question from the famous book ,The flying circus of physics,and the author is saying the ans is coriolis force. But I did not get it
A lot of my calc II students are asking me what are the real world applications of what we are studying in Calc II (right now we are studying methods of integrations, so of course one of the applications is in finding areas and volumes, are there any other cool applications? I mean something that can be explained in a simple way to a calc II student). Later we will study series and sequences. I'm just looking for ways to pick up the interest of my students, do you have any ideas?
Background to the sentence: a system activates itself after temperature has been deviated for [X] seconds. Now I want to describe what X does and I just cannot figure it out. My best attempts are: The value X specifies the time period for which the temperature has to be deviated. The value X specifies the time period during which the temperature has to be deviated.
In winter, our glass window serves as a separator of coldness outside and warmth inside our room. We know that the window feels cold when we touch it. Since the air temperature is different in different sides of the window, why does the window choose to be cold ? What's the temperature of the window ? Is it closer to the temperature outside or inside ? Why ?
Let us say that we have shape AXQY: And line AX is congruent to AQ. Line QY is congruent to XY. I do not believe that we have enough information to say whether this is a parallelogram or not, because we do not know if side AX is congruent to QY and AQ is congruent to XY. So, if this is a square, it is a parallelogram. Correct?
What would be the most important implications of finding an even number that cannot be expressed as the sum of two primes? Would the existence on one such number in anyway predict the likeliness of any more such numbers? Moreover, will there be any other theorems that can be proved/disproved because of this? P.s. The answer to the latter is most likely yes, I just asked that additionally for future reference (for myself and others)
I am a Tango for D adopter and appreciate it very much but I am very concerned with a threatening trend. I noticed that many prominent early members leave it. I perceive that as a strong vulnerability signal to the community because it's not outweighed by new entries. I am looking for an appropriate idiomatic way to convey the fact that they abandon/leave/quit with emphasis on the threat that it involves (Something akin to the French: "Ils quittent/abandonnent le navire").
What phrase, expression, or even well-known literary character signifies a 'bad/poor/incompetent/incapable teacher', that is, someone who is not good at teaching. I would like to describe a teacher in the same way that quack describes a doctor. Unfortunately 'incompetent' and 'incapable' are not very funny or witty, or insightful, or enlightening (nor are those words nouns), and I'd like my word to be rather less prosaic if possible. For example: Mark Carlson is a ______ , he cannot teach a thing.
If I were to personify death is their a better statement then "delay death". I have considered saying "negotiate with death" but that does not sound formal enough for the tone of my essay. I am trying to express that science continues to negotiate with death in order to delay it. Preferably with a negative connotation. I have considered "parley" however I dont know if that is the proper use for it nor if I should use it as "parley death" or "parley with death"
I have a problem to understand isolated systems..If I have a ball and throw it upwards..then the momentum is not constant because the system is not isolated...and the reason is the external force from the earth (weight)...But if I see earth-ball as a system then I have an isolated system and as the ball moves upward the earth moves downwards..(Thing that we can't understand) because of inertia......THE PROBLEM IS THIS....Ican explain the movement of a boat from the air because of the external force from the air.....but what if I think boat-air as one system that is isolated....then the force from the air is internal...what is happening here with the conservation of momentum???
This question came up today in the office. We sell single direction bus trips through our site (wanderu.com) but have not agreed on which English word(s) should be used in text. Is it one-way or one way? Does one or the other communicate that "way" is a noun (e.g. direction) as opposed to a verb (e.g. method to an end)? We consulted the Wikipedia disambiguation page, One-way, which links to pages like One-way traffic. This English for these pages would suggest "one-way" is the appropriate word. The images on the traffic page, however, has two words. Thanks in advance!
I am a chinese student and one of my friend, a chinese, wrote sentences like this: Just a little above me, he was fighting with all his might. On the summit of the mountain, he cried with joy. He was pretty certain that these sentences were correct but I am not so sure. I've heard sentences like His eyes bright, he talked vigorously or Her coat barely on her shoulder, she dashed out of her house, but I have never seen sentences like the ones my friend wrote, the ones with no subject in the front. Can anyone tell me the name of the sentences my friend wrote? And if possible, can you also tell me if the name of the sentences I wrote is verbless clause? Thanks.
You can obviously hear wind. From everyday experience, the stronger the wind, the louder its sound. But this sound is always similar, and quite distinctive, noise-like. Can one compute the spectrum of the noise generated by the wind? There is an inkling of an answer provided here: "Any way, once the wind starts doing non-linear things, it can generate periodic stresses, and from that you get the whistling or humming noise we all know and love." Could anyone expand on this, or provide references with more quantitative detail?
I've always been taught that a vowel before a double consonant following another vowel should have a short sound. Conversely, there are many situations where a vowel preceding a single consonant and vowel gets a long sound. Short Sounds: Mississippi - All I's except the last get short sound Communication - First O gets short sound Oppose - First O gets short sound where second O gets long Long Sound: Ape - A gets long sound Popery - O gets long sound Oppose - First O gets short sound where second O gets long Yet, I hear people use a short O in "operator" when using the word. Is this the correct pronunciation?
Even further, I would be happy to see a definition of the tikz language in the usual manner programming languages such as Java and Pascal are defined. The reason I ask is that I keep getting mysterious error messages for the tiniest typos. Essentially, incorrect use of the underlying languages leads to a "crash" of the compiler. This crash sometimes gives useful error messages, but sometimes they are hard to decipher.
All the words or phrases I know for people who stay up at night merely describe the habit of not sleeping (e.g.: a night owl or insomniac) I am looking for a word or phrase with an emphasis on working hard at night. These people work are different from insomniacs because they have no problem sleeping but they refuse sleep to work. They are different from night owl because they wake up early in the morning. To give more context, suppose a nurse with kids who has a normal day life like most people and takes care of the kids but also works most nights in a hospital.
This might be a very simple question, so sorry. I have encountered the expression "radiative particle decay" quite a few times now, and none of the sources ever explain what they mean by radiative: I imagine it is trivial, but I would like to know exactly what it is implied by that. Does it just mean that it is a decay during which other particles are produced? I.e. other particles are radiated?
I was sitting close to a speaker and I could feel the sound coming from it all over my body, especially in my heart, and it pounded with the loud beats of the music. Was my heart pounding because of the excitement at listening to the music or was I really feeling the sound in my heart and all over my body? I have some understanding that it is all about sound waves & acoustics (bass/low & high pitch/low and high notes etc.) but it is not clear to me. I hope I have correctly framed my question.
I know that stop can be a synonym for wait,btw. I know telling someone to wait means for someone to pause until a certain time. But telling someone to stop just means the person has to pause without a defined amount of time to resume (I hope this makes me sound smart haha). Here are some examples: "Wait! I want to tell you more." Would it be the same saying- "Stop! I want to tell you more. " I want to note, that I am a native speaker. I'm just a curious person and a thinker. :-)
Possible Duplicate: The effect of the anonymous letter I have a bit of a programming question, and I think it's in line with what LaTeX (XeLaTeX in my case) is suited to do. I would like to randomly use a font (from a list of fonts) for each glyph being typeset. I wanted to do this for a project in the style of a "ransom letter" - imagine individual characters being clipped from a different source. I wanted to use a set of fonts that were modelled after typewriters, all opentype fonts. How would I approach this? Ideally I would type the text normally, and have TeX do the heavy-lifting of randomly picking a character-set for each glyph.
Is there any word in English, which describes combination of username and password? Let's say, I want to say Enter your "this_word", meaning Enter your username and password. EDIT: I'll exlpain, why I need this (because I see that it's being asked), though I see some answers, which fit my requirements. I'm a software developer (freelancer) and I'm creating a Desktop application, where login/password pair is present. But after releasing the first version of application I got the feedback, that It isn't clear for 'stupid' (no offense, just expression) users what they have to enter. So before it was like: |username (placeholder)| |password (placeholder)| and after the feedback I want to change it to something like Enter your Google 'word' |username (placeholder)| |password (placeholder)| so, that's it.
This question arises from the commentspace in this question on stats.SE. My comment was: Last I checked Terry Tao was the pre-eminent mathematician of this generation? To which another commenter replied: Which generation is that? Note that I said "this generation" as opposed to our generation. My question is: does "this generation" associated with a date (timestamp) uniquely identify a generation, particularly in the academic context? How else can I identify a generation -- through reference to a specific person?
In Preskill's notes, John Preskill goes as If we scatter a photon off of a periodic array of needles , the photon is likely to be scattered in one of a set of preferred directions , where the Bragg scattering condition is satisfied. and further These preferred directions depend on the spacing between the needles , so by scattering just one photon , we can already collect some useful information about the spacing. How can the analogy with Bragg's diffraction help me understand Simon's problem ?
I'm using Lyx and I have problem with equations. I would like to add label to equation, but somehow I can't add label if formula is in table or float. Ok, I can take them outside and then I can label them. But(!), then I can't move the equations to left. Tried everything. The best would be, if I can keep equations in table, so I can adjust them easily. The result should be same as the last three equations with label. /poor English
When I put my little, cylindrical coffee straw into my coffee, the liquid immediately rises about half a centimeter up the straw without provocation. This is also the amount of coffee that the surface tension of the coffee will allow to stay in the straw when removed from the liquid in the cup. Keep in mind that all the while, the top end of the straw is open. Why does the level of the liquid in the straw insist on being higher than the level of all the liquid in the cup?
I have seen the answers to How can I center text/math inside a list environment. The accepted solution there, however, does not allow me to reference displayed equations. Another solution given there is a "crude" solution, requiring me to insert a command in each displayed equation. Is there a way to modify the accepted solution to the above question so that displayed equations can be labelled and then referenced? (My MWE is similar to that presented in answer to linked Q)
For mechanical and structural systems, one can often use the energy as the Lyapunov function. In electrical power systems, some methods have been used to determine Lyapunov functions and one can define feedback loops based on this. For Hamiltonian systems, the Hamiltonian can be taken as the Lyapunov function. However, how does one define the physical meaning of a 'Lyapunov function' in dissipative systems? Say for example, an ecosystem forest growth over centuries with rain and fire as the other variables?
As you know, the option ocgcolorlinks of the hyperref package disables colors of all links presented in a PDF file by printing it from Adobe Reader (and by compiling with e.g. pdflatex); as a result, they are printed in a default color. My questions are: Is it possible to disable not the color, but entire text (of the link), i.e. that it would be completely disappeared on the printed paper? Is it possible to do the same with an arbitrary text (i.e. not with the text of the link) or with an arbitrary figure?
If I have a curvilinear coordinate system and supposing I impose the condition that back transformations to Cartesian coordinate system are not permitted. I perform a rotation of the three axes( say latitude, longitude and a proprietary vertical coordinate) to a rotated system (with new latitude , longitude and vertical coordinate) can we still use Euler angles to define these three rotations ? These three axes are non orthogonal to each other.
The sentiments expressed in the tweets can be as accurate a measure as is found with precedental researches. If I change this sentence into the following ones, which one would be correct? The sentiments expressed in the tweets can be as accurate a measure as the sentiments that is found with precedental researches. The sentiments expressed in the tweets can be as accurate a measure as a measure that is found with precedental researches.
In his text "On the Application of the Theorem of the Equivalence of Transformations to Interior Work", Clausius wrote If the cyclical process is not reversible, the equivalence values of the positive and negative transformations are not necessarily equal, but they can only differ in such a way that the positive transformations predominate. Maybe my doubt is related to my inattention on reading the text, but which proposition he made use of in order to assert that the "net transformation" is necessarily positive?
I recently read a blog post on literate programming and that tex was written using this paradigm. So I thought it might be a good idea to read the original tex program's source, by Knuth himself (the pascal version) in the literal programming style. However, having downloaded the distribution, I only find the raw file tex.web in the directory, and the tooling available via package managers (ctangle, cweb) only works with C files. So I was wondering whether a PDF file with the literate programming output was available on line, yet an hour of searching online did not yield a result. So: Is there the literate programming output for humans available for the tex processor?
I was solving a practice Physics GRE and there was a question about springs connected in series and parallel. I was too lazy to derive the way the spring constants add in each case. But I knew how capacitances and resistances add when they are connected in series/parallel. So I reasoned that spring constants should behave as capcitances because both springs and capacitors store energy. This line reasoning did give me the correct answer for how spring constants add, but I was just curious if this analogy makes sense, and if it does, how far one can take it. That is, knowing just that two things store energy, what all can you say will be similar for the two things.
Let A be a an infinite set. Let B be a subset of N, where N is the natural number Say there is a one to one correspondent between A and B. However, B is not the whole natural number. B is only a subset of a natural number. Intuitively, this is very clear. N is even "bigger" than A. However, how to go from that to actually finding out that there is a one to one correspondence between A and N? Basically I am checking several different definition of countably infinite. One requires a one to one bijection between A and N. The other requires only an injection from A to N. The latter seems to be a weaker requirement.
I took a course in vector analysis this year. It was a two fold course. The first part covered linear algebra and basic euclidean geometry. The second took to more advanced areas such as differential geometry, and the integration theorems. We used vector analysis by Schaum(author: Murray Speigel). I was wondering if there are more books on the subject? Please make sure you state the things covered in the textbooks you mention.
When Studying the phenomenon of precession a classic example installation is this: a wheel spins around the Y axis, gravity applies and the upper part starts spinning around the Z axis. The textbook explained this with angular momentum, looks simple, but it is really weird when I try to think about this in other ways. Usually when i see something start spinning, i think there is an force pushing it, but in this case I can't find such a force. There is a kind of gap in my head, and it really disturbs me. Please help me.
Suppose there is a slanted capillary tube and a fluid rises in it. Why does the fluid rise to the same vertical height as when the tube is perfectly vertical? If I'm right surface tension force balances the weight of the lifted fluid. But in the case of a slanted tube, more fluid will be lifted and thus weight also increases. So why will fluid rise to same height?
Raring definition: very enthusiastic and eager to do something. I want to use rares, as in: He rares himself up, ready to tell her. I'm wanting to use it as in the cited example, meaning he gears himself up, sort of like an instant pep-talk, like readying himself. But it looks as though rares isn't a word for what I need it for. Can I use it like this or not?
I am thinking about possibility to parse LaTeX document. What I really need is to track category codes of symbols. As I understand TeX expands all of macros in his mouth and tracks changes of category codes without executing anything. Is it possible to check if the next token is a macro, collect it unexpanded (together with arguments), execute it and move to next token?
Could anyone clarify to me the following: Lightning gives off high current when it hits a car/vehicle, and since the electrical components of the car is grounded on the chassis, are there possibilities that these high currents can destroy or damage the electrical components,battery, antenna etc through the 'grounding'? what are the 'areas' or 'lightning zones' on my car which have the possibility of getting struck by lightning? My friend says the car is being 'positive' with respect to the ground(Earth) hence the lightning which is mostly negative flash tends to strike the car, How can the car be positive when the entire exterior of the car is mounted on the chassis which is negative?
If we have n gaussians where they have different scale and location parameters -- are they orthogonal to each other? By orthogonal I mean that the inner product is zero -- like it is for two cosine functions that have a different phase. So, by Gaussian I mean the normal function used for it's properties as a function and not as a source of Random variables.
This can also be applied to client-server interactions (which is what I need it for). For example, if you (the client) send data to the server or retrieve data from the server, what is the name of the server in that instance? Or, if the server sends data to the client or the server receives data from the client, what is the name of the client in that instance? Both of these names should be equivalent. Basically, I'm looking for a word (or words) for the other person/entity when the two are connected.