Task: Putting up a simple fence.
Participants: An engeneer, a physicist, a mathematician.
At their disposal: four stakes, wire.
Problem: Who would need the least material quantity?
The engineer would have a short look, drive the four stakes successively into the ground, twist wire around the square and - Bob's your uncle.
The physicist would ponder two minutes, drive three stakes into the ground, twist wire around the triangle and - Bob's your uncle.
The mathematician would see about the material given at his disposal - deliberate what to do - think - think twice - cogitate - consider and reconsider - contemplate - reason and reflect.
After four hours out of the blue he'd enthusiastically wrap the wire around his body and ... define himself outside.'
*
And what did Einstein say?
'As far as the laws of mathematics refer to reality, they are not certain, and as far as they are certain they do not refer to reality.'
