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By typing C-c C-f, you get a search prompt. You can search for (a combination of) several things:
intro – searches for theorems which can be applied with rule, i.e. that fit the current goal.dest – searches for theorems which can be applied with drule, i.e. whose major premise fits one of the assumptions.name: ident – searches for theorems that include ident in their name-name: ident – searches for theorems that do not include ident in their name