Community RSS Feed https://community.wolfram.com RSS Feed for Wolfram Community showing any discussions in tag Algebra sorted by active How to solve this difficult nonlinear equation involving InverseErf? https://community.wolfram.com/groups/-/m/t/3022388 Hello, I have a difficulty with solving the following nonlinear equation involving InverseErf[] using FindRoot: FindRoot[Sqrt[p*r]/InverseErf[(2/Sqrt[π])*Sqrt[p]]==1,{r,1},WorkingPrecision-&gt;50,PrecisionGoal-&gt;16] The problem is that when the argument of InverseErf[] approaches unity, the value of the function tends to infinity, but I need to obtain accurate values of &#034;r&#034; just close to this limit of the argument of InverseErf[]. Unfortunately, it seems it is not possible to have the parameter &#034;p&#034; greater than about p=78/100, which is still too small for my needs. The function InverseErf[] is supposed to return correct values for any argument between -1 and 1, but apparently it fails already when p=79/100. Is there any way to overcome this difficulty? Leslaw. Leslaw Bieniasz 2023-09-27T17:23:34Z Solve a multi-variable equation for one variable https://community.wolfram.com/groups/-/m/t/3023484 I want to plug this into Mathematica. Please help ln(x) − ln(y) = b − 2 ln(y) + a x Solve for y; assume x&gt;0. Thank you Zegna Picano 2023-09-29T00:34:05Z