The mathematical definition of marriage as represented in your bible is:

1+1=1

Adam and Eve are one.

Did you forget?

The most logical definition however would be human + human = marriage, and then we don't have silly arguments where you try to use meaningless equations to make your argument seem more valid.

You have exposed yourself to a damaging counter argument.

Such as: If marriage is between two humans then two eight year old boys can be married. Or, whatsoever perversion that can be deduced thereby.

(You failed to be specific, and thereby provided very little in the way of the limit of the extension of your definition. But what you submitted is equally as illogical as the definition you countered.)