Understanding the profound rules of conversion
Conversion is a kind of immediate inference. It has one premise and a conclusion. The premise of conversion is called convertend and the conclusion is called converse.
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Key notes on the profound rules of Obversion
Obversion is another type of immediate inference. The premise and the conclusion of obversion are known as obvertend and obverse respectively. In obversion we get an affirmative equivalent of a negative proposition or a negative equivalent of an affirmative proposition.