Imagine a garden where all roses are red.
Original: Every rose is red.
Valid converse: Some red things are roses.
Invalid: Every red thing is a rose.
A red chair shows why the last claim can fail while the original remains true. A counterexample is a powerful test of an alleged inference.
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Test a conversion with a counterexample
Simple Conversion of Propositions: Definition, Method and Rules
Imagine a garden where all roses are red.
Original: Every rose is red.
Valid converse: Some red things are roses.
Invalid: Every red thing is a rose.
A red chair shows why the last claim can fail while the original remains true. A counterexample is a powerful test of an alleged inference.