Recent content by troglodyte
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		I Struggling with one step to show quantum operator equality
Thank you for your reply. I thought I wouldn't get any reply so I have deleted them to reduce server costs.- troglodyte
 - Post #3
 - Forum: Quantum Physics
 
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		I Rotation and Boost of Tensor Components: Meaning?
Sorry,than i have misinterpreted your question a bit.- troglodyte
 - Post #5
 - Forum: Special and General Relativity
 
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		I Rotation and Boost of Tensor Components: Meaning?
A tensor could be also a vector.One call it a one tensor.A rotation is only a mathematical construction.Of course, a boost is also a rotation but with a physical meaning involved .Here you make a rotation in a Lorentz invariant manner.So the (relativistic)physics holds under this specific...- troglodyte
 - Post #2
 - Forum: Special and General Relativity
 
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		I Directional Derivatives of a vector ----gradient of f(P)----
I am glad that this Suggestion could help you🙂- troglodyte
 - Post #5
 - Forum: Differential Geometry
 
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		I Directional Derivatives of a vector ----gradient of f(P)----
Maybe you can also try Hubbard ,Vector Calculus,lineare Algebra and differential forms.It is didactically one of the best books on this level. Here is nice picture to the Lemma:- troglodyte
 - Post #3
 - Forum: Differential Geometry
 
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		B A covariant vs contravariant vector?
Not in all cases.In the language of mathematical physics one argue in strict mathematical language.Some theoretical physics profs prefer this language to describe physics.For example the canonical quantization for Boson particles without gauge potentials uses this formalism.I have actually one...- troglodyte
 - Post #6
 - Forum: General Math
 
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		I Parallel transport vs Lie dragging along a Killing vector field
Do we talk about closed curves?Because A curve is the image of a continuous function from an interval to a topological space(Wikipedia ).Doesn't this mean a curve implies per definition open neighbourhoods?- troglodyte
 - Post #3
 - Forum: Special and General Relativity
 
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		I Struggling with one step to show quantum operator equality
Hello guys, I struggle with one step in a calculation to show a quantum operator equality .It would be nice to get some help from you.The problematic step is red marked.I make a photo of my whiteboard activities.The main problem is the step where two infinite sums pops although I work...- troglodyte
 - Thread
 - Infinite sums Operator Quantum Quantum mechanics Quantum operator Taylor expansion
 - Replies: 2
 - Forum: Quantum Physics
 
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		A general potential energy for a multi-particle system
I would say no because of this pairwise description which you have stated above.Maybe some combinatorial arguments are missing to expand the concept to include also such cases.- troglodyte
 - Post #2
 - Forum: Mechanics
 
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		I Total energy of an isolated system
If your energy is conserved which means there exist no perturbation from outside the energy environment then you have T+V=E=constant or equivalent dE\dt=0 .So,you have an fixed Energy value which will transform from the kinetic/-to potential energy and vice versa.Therefore both types of...- troglodyte
 - Post #2
 - Forum: Classical Physics
 
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		Announcement Easy ways you can support Physics Forums
Thank You!:smile:- troglodyte
 - Post #88
 - Forum: Feedback and Announcements
 
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		Announcement Easy ways you can support Physics Forums
I posted it directly in my description where everyone can see it.- troglodyte
 - Post #87
 - Forum: Feedback and Announcements
 
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		A Off-diagonal elements in a density matrix
Sorry,but I don't understand your question not good enough to give you an answer.Try to make your question a little bit more concrete.Maybe you should post the reference where question is related to.- troglodyte
 - Post #2
 - Forum: Quantum Physics
 
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		Announcement Easy ways you can support Physics Forums
Wasn't this link to my reddit profile not enough which I had posted yesterday ?Maybe you You can give me some straight instructions what you are concretely mean by this. Thank you and best regards- troglodyte
 - Post #85
 - Forum: Feedback and Announcements
 
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		Announcement Easy ways you can support Physics Forums
Pls,correct me but it should be the following one: https://www.reddit.com/user/Plancktonian/ Or should I add it to my profile here?- troglodyte
 - Post #84
 - Forum: Feedback and Announcements