in the attached section from Peter Grindrod‘s book Pattern and waves from 1991, the authors refers to a book with the number [15] which contains some strong maximum principle for linear parabolic equations.
Unfortunately, I cannot see the Bibliography but maybe anyone can tell me which book he is citing with number [15]?
I would like to see the mentioned strong max. principle in that book.
Cheers!
It's good to give a quick picture only answer.