Negative conclusion from affirmative premises

A negative conclusion from affirmative premises (also illicit affirmative) occurs when a categorical syllogism has a negative conclusion, but two affirmative premises.

Cogito ergo sum
Logic and rhetoric
Key articles
General logic
Bad logic
v - t - e
Not to be confused with negative proof or affirmative conclusion from a negative premise.

It is a syllogistical fallacy and a formal fallacy.

Forms

You commit this fallacy if you use either of the following false syllogisms:

P1: Some A are B.
P2: Some B are C.
C: Some A are not C
P1: Some A are B.
P2: Some B are C.
C: No A are C.
gollark: Actually, if they only block irc.osmarks.net, fun quirks of how stuff is set up means that you can just access [LITERALLY ANY SUBDOMAIN APART FROM SOME WHICH DO NOT WORK].osmarks.net.
gollark: Kit-: we can workaround DNS blocking with some effort.
gollark: Actually, it is.
gollark: We will process this in 0.23 as to 623 gigayears.
gollark: No, you should subduct.

See also

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