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 Jan 8 suggested approved edit on How to calculate uncertainties of a natural exponential function? Jan 8 revised How to calculate uncertainties of a natural exponential function? Minor LaTeX formatting added. Jan 8 suggested approved edit on How to calculate uncertainties of a natural exponential function? Jan 8 answered Good book for Analytical Mechanics Jan 6 comment Eliminating IR light reflection perceived by a steep viewing angle The easiest way to accomplish your goal is as you said, add an IR filter to your camera. I would pick an "'interference" filter (eoc-inc.com/infrared_filters.htm). Jan 5 comment Connection between quantum physics and consciousness As far as I can tell, there is no logical definition of consciousness that compatible with physics. Jan 4 revised Non-commutative property of rotation Changed associative to commutative. Jan 4 suggested approved edit on Non-commutative property of rotation Dec 31 comment Why can't a spaceship accelerate for ever? Since there is no friction in space There could be magnetically induced drag that can occur when a conductor moves in an external magnetic field. Dec 28 comment Can you speed up radioactive decay of plutonium? @RichartBremer, what if the rocket blows up during launch? Dec 28 comment Why do we classify states under covering groups instead of the group itself? A group is an abstract mathematical object. Measurements/Experiments are in the real field. So, if you want to draw meaningful conclusions that you can verify experimentally, you have to work with operator representations (in $\mathbb{R}$) that are appropriate. Ultimately, if you cannot prove something (or its consequences) that can be experimentally verified, it is worthless. While this does not directly answer your question, I think it is a useful reminder on why we work with representations instead of abstract objects. Hence the comment. Dec 26 comment The two faces of $F = m*a$ It should be noted that only an external force can change the momentum of the system. There is some ambiguity here as one must first define the system of interacting objects. Dec 23 comment Integration question from book “e: The Story of a Number” by Eli Maor Make the change of variable in eq 3 as: $g-av=z$, then differentiate both sides and express the left hand side in terms of the new variable $z$. Dec 23 comment Is the superposition principle universal? I have to disagree with that. In fact the closure property of a group is the fundamental principle at play. The principle of superposition is antiquated and anybody who studies group theory will tell you that it is unnecessary terminology. The "+" can be replaced by another operation say $\diamond$. The point is, you have to decide which is the strong and which is the weak operation when you build a field from a group and two operations. Dec 23 comment Circular polarization: properties and detection There are a couple of things to consider. In your detection measurements, you are looking at energy, so polarization states are degenerate in this measurement. Polarization degree of freedom carries (loose terminology) angular momentum and a direct measurement of the angular momentum can be easily seen in light-matter interactions (my experience). To distinguish between polarizations, the easiest way is by using a high quality crossed polarizer arrangement. What wavelength are you working with? Dec 23 comment Thermal imaging camera Removed the -1 by adding a +1. Can you please stop the ridiculous drive by negative voting??? Dec 23 comment Is the superposition principle universal? I think we are speaking of different things. In nonlinear interactions, you are dealing with tensor spaces, which does not change the fact that the abstract field operations do not change. Dec 23 comment Is the superposition principle universal? Vladmir, what is the specific problem? Please check my comment above and see if it clarifies matters (a bit). Dec 23 comment Is the superposition principle universal? Nature as we know it can be organized as abstract mathematical objects, such as groups, rings and fields. If this is true, then the conclusion follows directly from the mathematics. For example, the Poincare group plays a central role in describing the fields you speak of. I will revisit this question, for it is a good one and I need a bit of time to organize my thoughts. :) Dec 23 comment Conservation of Energy in the Universe To calculate average energy density, you have to account for the radiation as well. I presume that this would be a difficult calculation. From an experimental point of view, there have be no reports of violation of energy conservation that I know of. Reasonable question, +1.