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Molly asked:

What's the term for a conclusion that is based only on its premise, e.g. "We do the things the way we
do, because we do the things the way we do."

I know this is not a syllogism. I don't think its a truism, either, but I'll look that up while I await your
reply.

============

A tautology.

It is also a syllogism (a valid deductive argument).

It is also a truism (something that is obviously and trivially true), but while tautology and syllogism are
used as technical terms in logic, truism is not.

Berta Black