Deductive logic can be expressed in terms of AND's and OR's. These are represented by unions and intersection, think Venn diagrams. If reality is logical, then unions and intersections (AND's and OR's) of protions of it must still be part of it. Can you imagine a reality where an intersection of two overlapping regions were not actually a part of reality too? Then accepting that reality is a topology and that we must be able to describe it mathematically if we are to discover or derive mathematical laws of physics, it would seem necessary that reality be some sort of manifold or another.ZapperZ said:Would you call what you have said above as "logical derivation"? I mean, really!