PeroK's latest activity

Suppose we have a sequence of shapes that converge in some geometric sense to a limit shape - bounded or unbounded. That does not imply...

I think there are two issues here, a purely mathematical one and a practical one. In the maths, we can model an infinite sheet as the...

Because they're using different definitions of ordinary language words. That's why we don't do physics using ordinary language. We do it...

Modern physics quite simply views "matter" to be any of the 17 quantum fields that appear in the Standard Model (SM)...

It seems to me a bit like saying all the people in the world are men, if we count women and children as part of "mankind".

@OmniThoughts, by joining this forum you agreed to abide by all the rules stated here...

There is matter, antimatter, radiation, possibly dark matter, possibly dark energy, spacetime (if you count that as something)...

So helium-4 atom doesn't occupy space?

While not definitive, one might make a good start by grouping all things into either fermions or bosons. Fermions obey the Pauli...

By “usual” I meant “usual for the infinite plane”. Most people, when solving the infinite plane problem, implicitly choose a boundary...

I don’t think they did go awry. It is a valid solution to Maxwell’s equations. It is just a different boundary condition than usual.

The horizontal component is zero, by symmetry. I've not got time to do the asymmetric calculation now. I'll do it later. Although...

Hello, The sum you're showing is a Riemann sum. The Riemann sum is $$\sum_{n=0}^\infty f(x_{n})(x_{n+1}- x_{n}) $$ with the function...

Re the above identity for ##\pi##. $$\int_0^{\infty} \frac 1 {1 + x^2} dx = \bigg [\tan^{-1}(x)\bigg ]_0^{\infty} = \frac \pi 2$$And ...

I've started a new thread on how to do this properly...