Which of the following statements is equivalent to the statement "Some neo-realists are not non-philosophers"?

ASome philosophers are not realists

BNo philosophers are realists

CSome realists are philosophers ✓ Correct

DSome philosophers are realists

Correct answer: (C) Some realists are philosophers

Explanation

Removing the double negation yields "Some neo-realists are philosophers", a particular affirmative.

The statement given is a particular negative about neo-realists and non-philosophers.

Obversion changes the quality and replaces the predicate by its complement.

"are not non-philosophers" becomes "are philosophers", turning the negative form into a particular affirmative.

This gives "Some neo-realists (realists) are philosophers", a particular affirmative.

The relation used is obversion, which preserves logical equivalence.

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