Recent content by enricfemi

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    Other Transitioning from Theoretical Physics to Software Dev: Steps & Difficulties

    How about apply physics? It needs both physics and CS.
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    Where Can I Find Simulation Learning Resources for Comsol Multiphysics?

    maybe you should learn it from the model library. start with the model library that contain sound modular.
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    How Can I Analyze the Frequency Response of an Electric Current Shell in Comsol?

    you can find it in the result modules. before that, make sure you used the frequency solve.
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    Exponential Map of R3: A Closer Look

    thanks, that's a brilliant construct. i think i have finally understood it.
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    Exponential Map of R3: A Closer Look

    Thank you, arkajad! So you mean the 1-parameter subgroup generated by vector field can be not exponential map?
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    Exponential Map of R3: A Closer Look

    I don not know whether I was right or not, please give me a hint. (R3,+) can be considered a Lie group. and its TG in 0 is still R3. suppose X as a infinitesimal generater, it can give a left-invariant vector field and also an one-parameter subgroup. but i think, this one-parameter...
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    What is a Lattice Point in Geometry?

    Do you mean this: http://mathworld.wolfram.com/PointLattice.html
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    About exterior algebra in vector calculus

    Thank you, ystael! I have found Spivak's calculus on manifolds and trying to read it. and so sorry that there maybe a misunderstanding: I know how to prove dy^dx=-dx^dy what i really confusing is why dx^dy=dxdy dy^dx=-dxdy Is it only happened at R3?
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    About exterior algebra in vector calculus

    I'm reading Marsden's vector calculus. In the chapter of differential forms, it mentions the wedge product satisfies the laws: dy^dx=-dxdy. and for a 0-form f, f^w=fw. Does it have formal derivation? hope someone can give me a hint or even a link.
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    Derivatives of a Constant in a Trigonometric Function

    if a is a constant y=a*f(t) then dy/dt=a*df/dt
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    Energy of Electron at 0.1c: Consider Relativity Effects?

    it is only need 2-3 kev for electron to reach 0.1c! is it right?
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    Energy of Electron at 0.1c: Consider Relativity Effects?

    that is my effort, cherk the nb of mathematica
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    Energy of Electron at 0.1c: Consider Relativity Effects?

    a electron with speed at 0.1c, what is it energy in the unit of ev. and when should we consider the relativity effects for the electron? thx
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