PeroK's latest activity
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PeroK replied to the thread A.I. Taking Over the Doing of Homework?.When I was growing up there was a children's TV serial called "The Changes". The plot was that everyone woke up one day and were... -
PeroK replied to the thread A.I. Taking Over the Doing of Homework?.Part of the problem is that the technology oligarchs have got western society under their control. Nothing can happen until we have...
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PeroK reacted to renormalize's post in the thread Graduate How to fix Relativistic QM so it's consistent? with
Like.
The following is taken from Bjorken and Drell, Relativistic Quantum Mechanics (1964), pp. 5-6: So the problem with the Klein-Gordon... -
PeroK replied to the thread Struggling to make relation between elastic force and height.It seems more logical to me to calculate the tension as a function of the distance from the top. Then the height is 3m minus this distance.
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PeroK reacted to martinbn's post in the thread Undergrad Midpoint(s) of the unbounded number line with Like.
Why is it a problem to say that the midpoint if ##(0, 2)## is ##1##?
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PeroK reacted to ergospherical's post in the thread Undergrad How to picture the vector potential? with Like.
Yes, in the general case ##\mathbf{A} = \mathbf{A}(x,y,z,t)## is some vector field that depends on position (and time), and you'll need...
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PeroK replied to the thread Undergrad Midpoint(s) of the unbounded number line.Everything. A finite open interval can be defined to have a midpoint in the obvious way. Compactification and Hausdorff distance have...
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PeroK reacted to WWGD's post in the thread Undergrad Midpoint(s) of the unbounded number line with
Skeptical.
I think there's no such thing as the middle/midpoint of an open interval in the Standard Real line. Maybe in the 1- or 2- point... -
PeroK replied to the thread Undergrad Midpoint(s) of the unbounded number line.A quick search suggests that midpoint normally applies to a (finite) line segment.
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PeroK replied to the thread Undergrad Midpoint(s) of the unbounded number line.There is no geometric midpoint. Whether zero is an algebraic midpoint depends entirely on how you define midpoint. More generally...
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PeroK reacted to tomwilliam's post in the thread Undergrad Midpoint(s) of the unbounded number line with Like.
Just chatting with my son about Maths and he casually mentioned that 0 would be the midpoint of the number line from -inf to +inf. I...
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PeroK reacted to PeterDonis's post in the thread Undergrad Where did the early photons go? with Like.
Because we have other ways of inferring what the properties of the universe were before it became transparent to radiation. For example...
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PeroK replied to the thread High School Why Do Events Freeze For Me at the Speed of Light?.What you see in a scenario like this depends on the travel time of light from an event on Earth to your spaceship. This sort of effect...
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PeroK replied to the thread Undergrad Where did the early photons go?.If you want to go beyond popular science, then you could try An Introduction to Modern Cosmology by Andrew Liddle. This is at an...
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PeroK replied to the thread Undergrad Where did the early photons go?.The simplest mathematical example that illustrates an infinite universe is the number line. With 0 in the middle (although...