Domain of existence and blowup for the exponential reaction-diffusion equation Juan Vazquez 35K57Reaction-diffusion equationblow upinstantaneous blowupglobal existencesingular solutions Indiana University Mathematics Journal 1999 text pdf 10.1512/iumj.1999.48.1581 10.1512/iumj.1999.48.1581 en Indiana Univ. Math. J. 48 (1999) 677 - 710 state-of-the-art mathematics http://iumj.org/access/