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Real number
01
実数
any number that can be found on the number line, including both positive and negative numbers, zero, and fractions
例
The eigenvalues of a symmetric matrix are always real numbers.
= 2x maps every real number x to its double.
The interval notation (−∞, 5) represents all real numbers less than 5, excluding 5 itself.
The interval (a, b), where a and b are real numbers, represents all numbers between a and b but excludes the endpoints.
