In mathematical philosophy, one asks the question "do mathematical objects really exist"?
This is then followed by "yes" or "no" answers, but does the question even make sense? Is it even meaningful to talk about the existence of an idea? Of a concept? Of a equation?
So basically, that's my question. When philosophers talk about whether mathematics is real or not, what definition of 'real' are they using? What definition of 'exist' do they use to judge whether mathematical objects exist or not?