Seems the link is broken (I have renamed the page). So I'm posting a new one:
New link to proposal > <https://github.com/sympy/sympy/wiki/GSoC-2017-Application-%5BDRAFT%5D-George-Korepanov:-computing-function-domain,-image,-preimage-&-enhancement-of-singularities,-sets-modules> -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/27b5babf-6fb8-4383-a34a-cec30acb6b87%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
