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  • For example, an environment variable with a standard name can store the location that a particular computer system uses to store temporary files—this may vary from one computer system to another. In all Unix and Unix-like systems, each process has its own private set of environment variables. — “Environment variable - Wikipedia, the free encyclopedia”,
  • Intuitively, a random variable can be thought of as a quantity whose value is not fixed, but which can take on different values; a probability distribution is used to describe the probabilities of different values occurring. Realizations of a random variable are called random variates. — “Random variable - Wikipedia, the free encyclopedia”,
  • In mathematics, a variable is a value that may change within the scope of a given problem In contrast, a constant is a value that remains unchanged, though often unknown or undetermined.[1] The concepts of constants and variables are fundamental to many areas of mathematics and its applications. — “Variable (mathematics) - Wikipedia, the free encyclopedia”,


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