Читать книгу Selected Mathematical Works: Symbolic Logic + The Game of Logic + Feeding the Mind: by Charles Lutwidge Dodgson, alias Lewis Carroll - Lewis Carroll - Страница 40

“All bankers are rich men.”

This is equivalent to the two Propositions “Some bankers are rich men” and “No bankers are poor men.”

Here we arrange thus:—

“Some | existing Things | are | rich bankers”; and “No | existing Things | are | poor bankers.”]

[Work Examples § 1, 1–4 (p. 97).]