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Logical proof question?

 
 
Penmer
 
Reply Mon 26 Dec, 2016 02:27 pm
Pick terms for A, B, and C which demonstrate that the following
syllogisms are invalid, and identify the figure of the moods.

1. AiB, CiB : AiC.
2. AoB, BaC : AaC
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fresco
 
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Reply Wed 28 Dec, 2016 01:14 am
@Penmer,
It would help if were to use standard logical connectives such as . for AND or v for OR.
However assuming i = IF a =AND, you need to choose truth values which make the conclusions false. If those values allow the conjunction of the premises to be true then the arguments are invalid
So in 1, use A=1,C=0 and in 2 use either A =0 or C=0 or both.
(If 'terms' means ' x is a cow , ' x is mortal' etc then choose appropriately)

By 'moods' I assume you mean the Latin terms for types of fallacy, which you can research yourself.
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