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Built-in Mathematica Symbol

SameTest

SameTest
is an option whose setting gives a pairwise comparison function to determine whether expressions should be considered the same.

SameTest->f specifies that f[e₁, e₂] should be evaluated whenever it is necessary to determine whether pairs of expressions e₁, e₂ should be considered the same.

Union of a set of integers:

Find a fixed point to a tolerance: