robphy's latest activity
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robphy replied to the thread Interval Kinematics.Instead of initial and final, it might be better to use event-labels: at event A, at time ##t_A##, the position is ##x_A##, and the... -
robphy replied to the thread Interval Kinematics.Did you mean non-inertial motion? So, with your ##a=9.8\rm\ m/s^2##, upward-increments along the Velocity-axis are associated with...
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Here it is playing rock guitar. Much better than a keyboard with a pitch wheel.
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robphy replied to the thread RIP Andrzej Trautman (1933 - 2026), relativity and gravitational waves.From https://trautman.fuw.edu.pl/publications/scientific-articles.html 39. (with W. Kopczyński) Simple spinors and real structures, J...
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robphy replied to the thread Cover songs versus the original track, which ones are better?.https://en.wikipedia.org/wiki/Hot_for_Teacher (1984) https://en.wikipedia.org/wiki/Van_Halen (1984) Van Halen - Hot For Teacher (Castle...
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robphy replied to the thread Rush Redux 2026.Rush performs Finding My Way live | 2026 Juno Awards https://www.rush.com/tour/fifty-something/
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robphy replied to the thread Graduate RIP Chen Ning Yang (1922-2025).A Celebration of C.N. Yang and His Impact on Stony Brook Wang Center Theater, Stony Brook University Thursday, March 12, 2026 1:00 PM...
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robphy replied to the thread Help with problem in MIT open course general relativity.There is a Levi-Civita tensor ( https://en.wikipedia.org/wiki/Levi-Civita_symbol#Example:_Minkowski_space ), which is the volume element...
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robphy reacted to dextercioby's post in the thread RIP Andrzej Trautman (1933 - 2026), relativity and gravitational waves with
Like.
The modern (post-1950) formulation of differential geometry is written in terms of fiber bundles, invented in the 1940s. Trautman was... -
robphy replied to the thread Request for a new History of Science subforum.As I mentioned in another thread, I think it's appropriately posted in GD (as "news") ... but afterwards, it would be good if it were...
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robphy reacted to symbolipoint's post in the thread Cover songs versus the original track, which ones are better? with Like.
That arrangement of "Rattlesnake" on a microtonal-fit classical guitar (Ken Murray) was interesting. As with many Rock type musics...
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robphy replied to the thread Cover songs versus the original track, which ones are better?.Rattlesnake (2016) https://en.wikipedia.org/wiki/Rattlesnake_(King_Gizzard_&_the_Lizard_Wizard_song)...
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robphy reacted to pinball1970's post in the thread Cover songs versus the original track, which ones are better? with Like.
Didn't expect that! Those fret boards freak me out.
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robphy reacted to Frabjous's post in the thread Request for a new History of Science subforum with Like.
The music threads are overwhelming the forum. There are so many posts that other topics get lost.
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robphy replied to the thread Help with problem in MIT open course general relativity.Probably useful (especially for conventions --- it's ##(-,+,+,+)##; it uses Carroll's text)...
