Thread 'How to define path if we only know velocity (without having common formulation)?' Hello! I invented the challenge and I attempt to resolve it: Enable we only know velocity of transferring particle: ##v(t)## from ##t=a## to ##t=b##. Simple to operate, it comes with many opening variants, rendering it perfect https://gabletoppak.com/why-i-switched-to-water-in-a-sustainable-box/