>Other sciences seek to discover the laws that God has chosen; mathematics seeks to discover the laws which God has to obey.
J. P. Serre
>From a metaphysical standpoint, I would say that mathematics is exactly what God didn't have to create, because it was all there from the beginning and He couldn't but take it as it is. (Maybe it may be said that mathematics is just part of God's own nature, namely the part of it to which human reason has access just by its own feeble means ...) God had an infinite choice about how to build a universe, with its laws (spiritual, physical, biological ...), and maybe there are many or even infinitely many such, of which we only know (ever so little) one. But whatever way he thinks up his Universe, He's got to use the same mathematics, with 2 + 2 = 4, and not 3 or 5. It is not in His power to change this, any more than to change his own nature – and surely He never had any wish to do so!
A. Grothendieck

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Why is it2+2=4and not2+2=5?

Why is it
2+2=4
and not
2+2=5
?