Generate the answer for a given question. The question requires common knowledge of English. Make sure that the answer is in detail, long, consistent with the context, and requires general knowledge of English. To be less repetitive, please vary your language for each question. Give a proper explanation to answer, and if necessary, provide the definition of various terms. And conclude your answer if it's long. If you have used other resources (e.g., Merriam Webster's.) to answer the question, include citations in your answer. You don't need to paraphrase the context of your resources, but make sure that your answer is consistent and complete.

Are both is equal to and equals similar in meaning? Which is the more natural? For example, one plus one equals two or one plus one is equal to two.
Both are grammatically correct and mean the same. And both are the natural ways of saying it. Use either.

Possible Duplicate: This question has been asked at/on SO? Which sentence is grammatically correct? The papers are freely available at the journal website. The papers are freely available on the journal website. Using Google's search results: available at the website returns 72,800,000 results. available on the website returns 106,000,000 results. So, I inferred that both variants are popular. Is this method (comparing the number of results by Googling) sound?.
Speaking as a longtime computer geek, files are said to reside on a hard drive or on a certain machine. Since I know that a website is made of computer files, I think of a website as being on a machine and so any part of the website is also on that machine. A website's 'address' is a 'Uniform Resource Locator' or URL. These terms connote the idea of website as 'place'. In this case the file would be at the website location. So, if you think of a website as it is actually constructed (files stored on hard drives), you will probably say on. If you think in the location metaphor, you will probably say at. Personally I find myself saying 'on' to other geeks and falling into 'at' when speaking with normal people.

Consider the following two sentences: Statement 1: The parameters were calculated a priori, and the other variables were calculated iteratively. Statement 2: The parameters were calculated a priori, and the other variables were calculated iteratively. This may seem trivial, but the only difference between the two sentences is the way in which the , has been formatted. In the first statement the , is in italics. In the second, the , is not in italics. Does it depend on the writer whether or not to italicize the punctuation marks adjoining the affected words? Or is there a definite rule governing this? The same question can be extended to other types of formatting, e.g. bold.

Here's one style manual's answer to that question: Italics do not include punctuation marks (end marks or parentheses, for instance) next to the words being italicized unless those punctuation marks are meant to be considered as part of what is being italicized: 'Have you read Stephen King's Pet Semetary?' (The question mark is not italicized here.) Also, do not italicize the apostrophe-s which creates the possessive of a title: 'What is the Courant's position on this issue?' This is really a style-manual problem, not an English usage or grammar problem. Each publication has its house style. Newspapers have their own style manuals, academic fields have theirs, and technical fields have theirs. There is no definite rule.