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2d
reviewed Close Constant Immersion Hydrometer
2d
comment Constant Immersion Hydrometer
I'm voting to close this question as off-topic because it shows insufficient prior research
2d
reviewed Close Rotation operator adjoint multiplication
2d
comment Rotation operator adjoint multiplication
@Paul777: downvotes here don't mean we all hate you! A downvote just means the site members don't think it's a good question for the site. I know downvotes feel personal (I hate getting downvotes :-) but they really aren't. In this case I suspect people feel that the whole question is based on what the notation $O(d\phi^2)$ means, and this doesn't involve any great physical insights. Don't let the downvotes put you off using the site, and good luck with learning QM - yes, it is hard!!
2d
reviewed Close Apply torque in 3d
2d
reviewed Close Humans Voice Frequency?
2d
reviewed Close Spontaneous symmetry breaking of a spinor / vector field
2d
comment Definition of the Lorentz transformations
@Procyon: the invariance of the line element cannot be proven (except of course by comparison with experiment). It is an assumption on which the theory is based. But see the addition I made to my answer to address user1620696's comment.
2d
comment Definition of the Lorentz transformations
@user1620696: I've extended my answer to address your comment
2d
revised Definition of the Lorentz transformations
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2d
comment Gravitational entropy
Possible duplicate of Immediately after the Big Bang, was the universe in a state of extremely low or extremely high entropy?
2d
reviewed Leave Closed Electric potential inside a solid sphere
2d
reviewed Close Classical space-time and quantum indiscernibility
2d
reviewed Close Unphysical degrees of freedom in the Yang Mills Lagrangian
2d
reviewed Leave Open stimulated emission in lasers
2d
reviewed Close Does an electromagnetic wave necessarily contain many photons?
2d
reviewed Close When to use Quantum Mech.?
2d
revised Definition of the Lorentz transformations
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May
1
answered Definition of the Lorentz transformations
May
1
reviewed Reviewed Brightness of 2 Lightbulbs hooked up to Capacitor