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In Mathematica Stack Exchange they provided an example very similar to the one I included above, however I did not get the tabular format. I tried also to transform it into a "csv" format, and an error message also popped up. I tried the suggested...
thank you once again, got it.
Hans, thank you for your time. Here is the block dedicated only to the reaction diffusion solution. Comments were added to the end of each line to be understood. The workflow is as follows: Definition of the region (rectangular region) ...
Bill Simpson, thank you very much for both, your time and your help.