> We can't see or think anything concrete. We have never touched anything 'physical' or 'real'. It's all abstract representations in our brains. This is some s

> We can't see or think anything concrete. We have never touched anything 'physical' or 'real'. It's all abstract representations in our brains. This is some sectarian preaching in my opinion. The whole thing including these very Western philosophical sects are possible exactly because something concrete definitely exist. The DNA and the laws which make it stable and the whole life on top of it is the consequence of the fact that something concrete is out there. This, BTW, is an millennia old debate between some branches of esoteric Eastern schools and should, perhaps, be a part of seconady school lectures. As for definitions of infinity, the theoretical possibility of infinite series, infinite small numbers or infinitely many real numbers between 0 and 1 is nothing but mental constructs. There is not a single "concrete" infinity.