set G2 = the removeVertex of G,v;
set G3 = the removeVertex of G,v | _GraphSelectors;
take the removeVertex of G,v | _GraphSelectors ; :: thesis: ( the removeVertex of G,v | _GraphSelectors is Subgraph of G & the removeVertex of G,v | _GraphSelectors is removeVertex of G,v & the removeVertex of G,v | _GraphSelectors is plain )
thus ( the removeVertex of G,v | _GraphSelectors is Subgraph of G & the removeVertex of G,v | _GraphSelectors is removeVertex of G,v & the removeVertex of G,v | _GraphSelectors is plain ) by Th9, GLIB_006:16; :: thesis: verum