Daily Drills 22 - Section 22 - Question 3

P: A → BP: A → CP: At least one A exists.C: ?

3scobar14 August 24, 2019

Double A

Confused on why some is utilized when A is in both properties A > B Shouldn't the premise be Not B > Not A I get that atleast one A exist but it doesn't exclude BOTH A from existing Plus all the other answers are equal to each other so by process of elimination B > C Not C > not B > not A?? I know I'm wrong, just confused

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Raechel-Brodsky May 22, 2020

Hi I don't understand how the contrapositive equates to a "some" principle.