|visits||member for||1 year, 9 months|
|seen||Aug 15 at 21:37|
Reversing the Ricci flow
@GrumpyParsnip: time-reversing heat flow equation is impossible, provided that heat diffusion process by definition generate entropy and thus the information is lost. This is not true for most of the differential equations, notably in solid dynamics, where intial conditions and equation uniquely define all time positions. The reason it is true for heat diffusion equations is that it not with a set of point in canonical corrdinates but a volume. However, because of convergence of solutions of diffusion equation, this volume diverges if time is reversed.
Brownian motion hitting probability
@Did: Would you mind giving an answer in case $g(t)$ is a constant?