Question

$\Longleftrightarrow \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ What \: is \: the \: meaning \: of \: this \: sign \: (the \: sign \: above)?$
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Answer 1

Answer:

that it is increasing in both the sides

Answer 2

Answer:

This is a Logic symbol that is said as if and only if or iff for short or means the same as

Example: A <-> B is true if both A and be are True or both are False.

Hope it helps!!