FILE SELECTED // FILE 00
Denying the Antecedent
“Closing one route does not prove the destination is unreachable.”
01 / SUMMARY
In short
The invalid form is: if A, then B; not A; therefore not B. A can be sufficient for B without being the only way to obtain B.
03 / SCENE
In the wild
If I take the train, I reach downtown. I did not take the train. I might still have arrived by bicycle.
04 / LIMIT
The limit
Confusing a sufficient condition with a necessary one erases genuine alternatives.
FINAL NOTE
What remains
Before denying B, ask whether routes other than A were available.