### array:

Matrix
* Matrices Solve two equations in two unknowns graphically, by substitution or by elimination
  - also form an algebra
* Matrices are a special type of an array
  - tool used in many diverse fields to describe problems and formulate solutions
* Matrices are also to represent, and solve, systems of linear equations
  - very common in computer science
* Matrices are basically tables of homogenous data - like a spreadsheet of numbers
  - constructs of rows and columns
  - notation for transformations
  - often an efficient way to handle linear systems
  - part of linear algebra
  - special in the way that they multiply
  - useful for representing data and are very efficient for working with data
* Matrices can be elements of larger matrices
  - contain either real or complex numbers
  - store data and solve problems with groups of numbers
  - hold energy in form
  - turn up as representing linear transformations for a fixed pair of bases
* are arrays
  - enclosures
  - films
  - mold
* are part of bones
  - cartilages
  - connective tissue
  - nails
  - rocks
  - television shows
  - the background ecosystems or land-use types in which patches and corridors are set
* is an array
+ Matrix (mathematics): Linear algebra
  * Many natural sciences use matrices quite a lot. Matrices are also very common in computer science.

### array | matrix:

Bone matrix
* consists of collagen and minerals.
* is crisscrossed by blood vessels and
  - the organic structure onto which minerals are deposited

Extracellular matrix
* is mucinous with eosinophils, mast cells, plasma cells, and lymphocytes.
* promotes differentiation of retinal pigment epithelium.

Square matrix
* Some square matrices have inverses.
* Square matrices are a special case in several regards.

### array | matrix | square matrix:

Diagonal matrix
* Diagonal matrices play a crucial role in matrix theory.
* square matrix

### array | matrix | square matrix | diagonal matrix:

Identity matrix
* Identity matrices are examples of diagonal matrices.
* diagonal matrix

### arrays:

Multidimensional array
* are arrays.
* can be numeric, character, cell, or structure arrays.

### arrivals:

Docking
* are arrivals.
* involves flying close to an object and matching speed with it.
* is carried out when puppies are tiny
  - the process of removing the tail to prevent problems from fly strike
* modeling process in which the interactions between molecules are examined.
* specifically refers to joining of two separate free-flying space vehicles.

Landing
* are located in airports
  - apartment buildings
  - marinas
  - oceans
  - stairwells
* are part of seaports
  - stairways
  - platforms
  - structures
* refer to the amount of catch that is brought to land.

### arrivals | landing:

Marina
* health messenger who works independently with women in prostitution.
+ Marina and the Diamonds: British pianists :: Greek-British people :: Welsh pop musicians :: Welsh singers :: 1985 births :: Living people
  * Marina is classed as a New Wave artist by critics. She is mostly known for her pop, electronic and more alternative music.

### arrogance:

Contemptuousness
* is arrogance
* refers to an arrogant and defiant person.

Arsenic compound
* Many arsenic compounds act as carcinogens
  - can dissolve in water
* Most arsenic compounds can dissolve in water
  - have no smell or special taste
* Some arsenic compounds are used as poison gases.
* affect the nervous system, liver, kidneys, and other vital body tissues.
* are acutely poisonous by ingestion
  - potent human carcinogens
  - used as insecticides and in other poisons
  - very poisonous to plants and animals
+ Arsenic, Uses: Semimetals :: Chemical elements
  * Arsenic was used in medicines in the 1700s, 1800s, and 1900s. Arsenic trioxide was used to treat cancer. Very tiny doses of arsenic compounds can act as stimulants. Some arsenic compounds are used as poison gases.