is it possible to 'rent' in a webpage or similar a mathematician ?
i mean, for example i am a physicist or a chemist and i must solve an equation or math problem
are there places to 'pay' a mathematician to do the calculations for you ? you pay him and he/she helps you with your equation or solve your equation
im not telling only about homework but suppose i have an equation i can not solve (because i am not intelligent) like $ u_{t}=U_{xxxx}+f(u,x,t) $
then i 'rent' someone to do the calculations for me ? does it exists? as a businnes or similar