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March 6, 2015

March 6, 2015

Posted by **Mike** on Tuesday, October 20, 2009 at 11:47pm.

All butterflies are winged creatures

Therefore, all butterflies are flies

I believe this is an invalid syllogism, not 100% sure. Can you explain why it would be valid or invalid please

- Critical Thinking -
**jim**, Wednesday, October 21, 2009 at 8:27amA valid syllogism is:

All A are B

C is A

therefore

(since C is A and all A are B)

C is B

The non-syllogism above is:

All A are B

All C are B

Therefore all A are B.

Erm, no.

Spot the difference. Here's one of the same form:

All fish are animals

All birds are animals

Therefore all fish are birds.

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