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True or false: what conversion allows

Exercise and reference answers

Questions
  1. Statement is true
    Yes
    Statement
    'Some S is P' converts to 'Some P is S'.
  2. Statement is true
    No
    Statement
    'Some S is not P' converts to 'Some P is not S'.
  3. Statement is true
    No
    Statement
    From 'Some men are not cooks' you may infer 'Some cooks are not men'.
  4. Statement is true
    Yes
    Statement
    O cannot be truly converted.
  5. Statement is true
    Yes
    Statement
    'No S is P' converts to 'No P is S'.

Explanation

The book is explicit that O cannot be truly converted: from 'Some men are not cooks' you cannot infer 'Some cooks are not men'. Source: Logic: Deductive and Inductive, Carveth Read (1898), public domain.
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