## Articles

Harvey Friedman tells us about a mathematical movement called constructivism and why we need it.

How can we get a grip on the uncertainties in mathematical models?

Can a mathematical object be said to exist if you can't construct it?

Physics is all about observation. But how much can we actually see with the naked eye?

Observing the smallest building blocks of matter doesn't involve seeing in the ordinary sense.

If you can prove that a statement can't possibly be false, does this mean it's true?