Chris White
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 Sep 14 comment NED vs. SIMBAD: Which is more accurate? I think the 6.27 is coming from the B-band value they got from RC3, which agrees with the more primary RC3 source. I suspect whatever discrepancies there are are a combination of mixing up B and V bands and digit switching (note 3RC gives B-V of 0.55, so V would be 5.72, which is what SIMBAD reports and is essentially what NED reports in that band). Sep 14 comment NED vs. SIMBAD: Which is more accurate? Also, can you link to where you see 5.27 in SIMBAD? I see 5.72 (V-band) and 6.27 (B-band) here. Sep 14 comment NED vs. SIMBAD: Which is more accurate? Hmm, in the actual photometry section NED lists a V-band magnitude of 5.28. Not sure where the 6.27 comes from. Sep 14 revised NED vs. SIMBAD: Which is more accurate? edited tags Sep 14 answered How to prove a symmetric tensor is indeed a tensor? Sep 13 comment Difference between Cartesian product and tensor product on gauge groups @ACuriousMind And then those same physicists will call $\otimes$ a direct product. Sep 13 reviewed Close Two synchronised clocks accelerated perpendicular to Earth's gravitational field Sep 13 reviewed Leave Open Question on the logic behind quantum computing Sep 13 comment How to calculate the radius of a main sequence star based on mass? Diagram and table that answer your question. Sep 13 awarded Nice Answer Sep 13 comment Relieving Tension in a String I've never seen a zither up close, much less played one, so I'll just leave this as a comment. It sounds like you're just increasing the effective length of the string. Sure, there's a slight increase in tension (frequency goes as the square root of tension), but there's a significant increase in the length allowed to vibrate (frequency goes as the reciprocal of length). Sep 12 reviewed Leave Open Does it take less time to drop a ball than fire one horizontally (with $90^{\circ}$) Sep 12 reviewed Close What are the most efficient ways to transmit force through air? Sep 12 reviewed Leave Open Water bottle rocket: Where does the energy go without water? Sep 12 comment How can you have $\frac{DA^\mu}{d\tau}$? While we're on the topic of notation, you should be aware that 99% of GR literature uses $\nabla$ for the covariant derivative in your first equation, not $D$. Sep 12 reviewed Leave Open How can you have $\frac{DA^\mu}{d\tau}$? Sep 12 reviewed Close Rotation Operators Sep 12 reviewed Close EMF produced when a square wire is pulled from the corners Sep 12 reviewed Close expansion of space and time vs passage of time Sep 12 reviewed Close How to find power dissipation of bulbs