Notations!

[AndreiRoibu]

Please add variable and function names here: https://docs.google.com/document/d/1OchpQ0GmPcWCc_K6HbnPdgbA3rwQM04igVNfq-CIWos/edit?usp=sharing

[Rebecca-Rumney]

PAPER: https://link.springer.com/content/pdf/10.1134%2FS1560354718020028.pdf

[alisterde]

finite difference paper: https://www.researchgate.net/publication/286468727_A_finite_difference_method_for_the_Fitzhugh-Nagumo_equations

[AndreiRoibu]

https://link.springer.com/content/pdf/10.1140%2Fepjp%2Fi2017-11787-x.pdf