I think the mistake lies not on whether physical reality is an illusion but on our persistent ignorance of thinking that our limited concepts are well enough to cover our perception . It's deeply mistaken since Newtonian physics since ignore our existence and measurement is a important part of p...

I asked this on the worldbuilding stackexchange but realise it may just be a straight physics question. My understanding of wormholes consists basically of an extrapolation of the way I understand a flatlander's experience of the following illustration of an Ellis wormhole: Right now, there ar...

Wouldn't you think that once people realize that the earth is not a globe but flat with firmament above,it would start to make more sense?

Caveat number 1: strictly speaking, no one actually works in the theory $T$, just as no one actually works in the theory $\mathsf{ZFC}$. Mathematicians work by means of carefully used natural language and not within a formal system. Formal systems are formulated as approximations that try to mode...

I was wondering if the cardinality of a set is a well defined function, more specifically, does it have a well defined domain and range? One would say you could assign a number to every finite set, and a cardinality for an infinite set. So the range would be clear, the set of cardinal numbers. B...

In classical theory (e.g., classical mechanics and electromagnetic theory), we introduce the complex values for the mathematical convenience, e.g., A=(a+a*)/2. There, the use of complex values (or vectors) is not necessary as we can in principle describe everything with real values (or vectors). ...