Could someone please explain why if the time-independent heat equation can, via changing of variables, take the form of Bessel's equation that the $\sqrt\lambda$ should take the values of the zeros of $J_0$ from slides 20-21 of this powerpoint printout? Thank you. (Also, what is that $a$?)
closed as off-topic by Emilio Pisanty, Qmechanic♦ Sep 5 at 18:21
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