Thread 'How to find route if we only know velocity (with no widespread formulas)?' Hi! I invented the condition And that i try to unravel it: Enable we only know velocity of transferring particle: ##v(t)## from ##t=a## to ##t=b##. There is apparently no strategy for simplifying or rearranging the integral. https://gabletoppak.com/why-i-switched-to-water-in-a-sustainable-box/