#### Please [explain like I’m 5 years old](https://www.howtogeek.com/694298/what-does-eli5-mean-and-how-do-you-use-it), compare and contrast ALL 4 symbols =, ≡, ↔, ⇔.
All answers beneath are too knotty and byzantine to my secondary school daughter.
– https://math.stackexchange.com/q/500644
– https://math.stackexchange.com/q/3926367
– https://math.stackexchange.com/q/2432462
## https://math.stackexchange.com/q/4645583
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An equal sign is used to show a value is equal to another. 1+1=2
The equivalence sign is used to define one thing as equal to another. e is defined as (tribar symbol) lim x->infinity (1+1/x)^x
The material biconditional is the same as the equivalence sign.
The logical biconditional is just “if and only if” whatever is on one side must have the same truth value as the other side. It’s essentially an equal sign for boolean values.
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