there would be a difference if A not equal B.

So saying A=B is taken for granted to mean A NOT "not equal" B. You immediately must refer to difference between "equal" and "not equal", which is itself the logical relationship giving meaning to statement "A=B".

You said it yourself Alex... everything follows from more fundamental existing relationship.

>>>Therefore everything existing has mathematical if-then (=cause-effect) relationship with more fundamental existing object.>Why should, for example, mathematical symmetry A=B come from somewhere?>...everything existing has mathematical if-then (=cause-effect) relationship with more fundamental existing object