robphy's latest activity
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robphy replied to the thread Danish Scientists.I didn’t catch that myself until I read her Wikipedia page. My subset comment was about the links to the two Wikipedia pages I posted. -
robphy replied to the thread History Biographies, History, Philosophy of Physics.Some history behind the Perimeter Institute for Theoretical Physics in Waterloo, Ontario. (I visited PI when it was just the brownstone... -
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... -
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... -
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... -
robphy replied to the thread Rush Redux 2026.Rush performs Finding My Way live | 2026 Juno Awards https://www.rush.com/tour/fifty-something/ -
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... -
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... -
robphy reacted to dextercioby's post in the thread RIP Andrzej Trautman (1933 - 2026), relativity and gravitational waves with
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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... -
robphy reacted to symbolipoint's post in the thread Cover songs versus the original track, which ones are better? with
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That arrangement of "Rattlesnake" on a microtonal-fit classical guitar (Ken Murray) was interesting. As with many Rock type musics...





