Math is an internally consistent set of rules. We use it for convenience and apply it to the real world, but math does not itself describe reality.
1=1 in math. 1 apple = 1 apple in math if we define an apple as a unit.
But in the real world apples are not equal. They can be different sizes, quality, types, etc.
So the math is correct as math. It is not correct when applied to the real world.
Math is a tool. It can be used incorrectly.
Latest Answers