what is the symbol for greater than or equal to
Greater-than sign The greater-than sign plus the equals sign (>=) is used for an approximation of the greater than or equal to sign (≥, the opposite of ≤). ASCII doesn't have a greater-than-or-equal-to sign.
Limit of a function (the Dirichlet function) has no limit at any x-coordinate.
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Exponentiation Any nonzero number raised to the 0 power is 1:[11]