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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 should be evaluated whenever it is necessary to determine whether pairs of expressions , should be considered the same.

Union of a set of integers:

Union considering comparison modulo 3:

Find a fixed point to a tolerance:

Union of a set of integers:

Out[1]=

Union considering comparison modulo 3:

Out[2]=

Find a fixed point to a tolerance:

Out[1]=