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A letter or symbol used to represent an unknown quantity is typically called a variable. In mathematics, common variables include letters such as ( x ), ( y ), and ( z ). These variables can stand for different values in equations and expressions, allowing for the representation of general cases and relationships between quantities.
The letters b and c could represent almost any number. They are used in equations normally because they are unknown, and so that we can figure out their values through solving the problem.
The mathematician David Hilbert used names of colors, such as "white" and "black," to represent unknown values in his work in mathematics and logic. This approach was part of his concept of "Game Semantics" where colors were used to represent players and moves in mathematical games, allowing for the study of logical systems.
variable expression, I believe.
Numeric array has numbers(+integers) that represent the values Associative array has strings that represent the values