9.13.3 Can you answer these questions?

9.13.3.1 How can we find the appropriate values of unknowns such that the following expression must be a real number? `FindInstance`

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=283572

Question: I have some mathematical functions including various parameters. I want to find instances for the parameters such that the function must be in a real domain after substituting the values of ... 
[findinstance]
 

asked by RF_1 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=80263 Score of 4

answered by Ulrich Neumann https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=53677 Score of 0

9.13.3.2 NSolve return incorrect roots at high precision but correct at lower precision

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=283474

I'm running ver. $13.2$ and working on a $995$-digit precision equation shown at the end of this post and assigned to variable  eqn1 .  Running ... 
[equation-solving]
 

asked by josh https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=81539 Score of 1

9.13.3.3 How can I use RandomFunction to solve an SDE in reverse time?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=283607

I am working with a problem of the Ito-stochastic differential form given by 
$$\mathrm{d}x=g(x,t)\,\mathrm{d}t+f(x,t)\,\mathrm{d}W,$$ 
where $W$ is a Wiener process. 
I furthermore have to satisfy the ... 
[differential-equations] [random] [stochastic-calculus] [random-process]
 

asked by JAC https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=80716 Score of 1