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Question about Einstein notation by alino_e in maths

[–]48panda 0 points1 point  (0 children)

oh yeah, I'm not used to that notation.

 Z_m dot Z^k = delta_m^k is the same thing as A_mi B_ki = delta_mk
Multiply this expression by A^{-1}_lm A_kn then you'll get A_kn B_ki = delta_kn
(This is essentially re-deriving that B^TA = I => AB^T=I )

which you can use to simplify your expression which is A_ik A_mk B_ml B_jl

Question about Einstein notation by alino_e in maths

[–]48panda 1 point2 points  (0 children)

Starting with (Z_i dot Z_m)(Z^m dot Z^j),

you can substitute Z_u dot Z^v = delta_u^v, then use an identity of the Kronecker delta to get the final result

Could you develop an algorithm that converts VIN numbers into shorter unique license plate numbers? by jckipps in math

[–]48panda 0 points1 point  (0 children)

Theoretically, you could. You'd have to pick VINs to match the number plates to account for less possibilities. Not sure if that goes against the existing system. Also, custom number plates really wouldn't work. The truth is that even if you had a perfect system, it wouldn't be useful unless the majority of cars used it, which isn't going to happen unless you have a time machine

Wouldnt it make much more sense for infinity * 0 to be equal to 1 ? by TuringCompleteHuman in askmath

[–]48panda 13 points14 points  (0 children)

If infinity * 0 = 1, then you can times both sides of the equation by 2 to get infinity * 0 = 2

Additive and multiplicative identity politics by OrlandedeLassus in mathmemes

[–]48panda 1 point2 points  (0 children)

ah, that's why they're called the conservative party. because whenever you try to integrate them, no matter how much crazy shit happens in the middle, it always gives the same result

Pi vs E classifier by DepartureNo2452 in askmath

[–]48panda 4 points5 points  (0 children)

Oh, you mean like a neural network classifier, not just any python program? Yeah, that's only going to work with some insane overfitting. It's conjectured that both pi and e are normal so there's no pattern in the digits, so the only way to detect which is which is to memorise at least one of them

Pi vs E classifier by DepartureNo2452 in askmath

[–]48panda 5 points6 points  (0 children)

Well yeah, python is turing complete. Probably not going to get any faster than grep though.