(mathematics or logic) such that the terms of an expression cannot be interchanged without changing the meaning; "the arguments of the symmetric relation, `is the father of', are noninterchangeable"
such that the terms of an expression cannot be interchanged without changing the meaning; "the arguments of the symmetric relation, `is the father of'', are noninterchangeable"
such that the terms of an expression cannot be interchanged without changing the meaning
