Please refresh my memory

Edsaintvil

On what kinds of questions are those invalid existential conclusions relevant?
Like, A-->B some C
And we can't conclude A some C.
Are these in must be false questions? Has anyone come across a question that deals with this kind of bad conclusion?

cole.w.murdoch

Parallel method of reasoning, parallel flaw method of reasoning, must be true, must be false. That's what I can remember off the top of my head.

Edsaintvil

Ah, thanks a lot!