Logical equality
From MathWeb
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Logical equality is an operation on two logical values, typically the values of two propositions, that produces a value of true if and only if both operands are false or both operands are true.
The truth table of p EQ q (also written as p = q, p ↔ q, or p ≡ q) is as follows:
p  q  p = q 

F  F  T 
F  T  F 
T  F  F 
T  T  T 
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