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Arthur
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question
126
What, in simplest terms, is gauge invariance?
Jul 8, 2016
answer
36
Why did we expect gravitational mass and inertial mass to be different?
Apr 14, 2021
answer
26
Why isn't an infinite, flat, nonexpanding universe filled with a uniform matter distribution a solution to Einstein's equation?
Sep 24, 2018
answer
25
How does 'Tear Here' work?
Jun 12, 2017
answer
10
What do we mean when we say the CMB has a temperature and how do we measure it?
Jun 13
answer
8
Why is force a vector?
Dec 4, 2017
question
7
Why do you fall towards the center of a black hole?
Aug 4, 2016
answer
7
Are the Christoffel symbols all zero in gravity-free space?
Oct 16, 2017
answer
7
Why isn't energy conserved in this collision problem?
Nov 2, 2018
answer
7
Is energy more fundamental than force?
Nov 10, 2019
Top network posts
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182
Why is the product of two rotation matrices not commutative?
139
Is it impossible to perfectly fit a polynomial to a trigonometric function on a closed interval?
90
Are polynomials with the same roots identical?
88
Are there primes of every possible number of digits?
75
Can you give me some concrete examples of magmas?