# Tagged Questions

Questions about multigrid methods for numerically solving differential equations.

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### Coupling Boundary Condition of one PDE with source term of another PDE

We have a system of equations, wherein the BC of one PDE is coupled with the source term of another PDE. We have a regular 2D unit grid in x and y. There are two PDEs to be solved The first PDE (...
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### Transform cos to e function

What are the steps in order to transform the cosine function to the exponential function: $$\left[\cos \left(\frac{k \pi} N\right)\right]^n \approx e ^ {\frac{-n}2 \left(\frac{k \pi} N \right)^2}$$...
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### Multigrid for power of two number of grid points

Until now I have written a C++ geometric multigrid code for solving problems with number of grid points of the kind 2^l+1. For these problems the spatial step size is one over an even number. This ...
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### One Million Proficiency Efficiency Calculations

I have been playing the "Million" game on my apple device after discovering it through the trending applications in the search function. After beating the game I began to wonder to myself if there was ...
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