If it was not exactly what the conclusion’s diagram would look like, then it was not. Venn gave us a simple, turn-the-crank means of clearly seeing why the 15 forms of the Aristotelian syllogism ...

It's a funny old world. If you'd asked me this morning if I understood Venn diagrams, my answer would have been a resounding” “Yes!” Quite apart from anything else, some time ago I penned a rather ...