Four types of propositions and 15 valid forms of categorical syllogisms with Venn diagrams and examples. [S= subject (minor term in premises); P= predicate (major term in premises); M= middle term (either subject or predicate in premises). Shaded (coloured) area = 'NONE', "X" = 'some exist', white area = 'ALL'.]
Compiled from various sources, including wiki. See also http://www.philosophypages.com/lg/index.htm
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