Formal fallacy

It focuses on the role of logical operators, called propositional connectives, in determining whether a sentence is true.

Mathematical fallacies are typically crafted and exhibited for educational purposes, usually taking the form of spurious proofs of obvious contradictions.

"[4] "The vet can't find any reasonable explanation for why my dog died.

Indeed, there is no logical principle that states: An easy way to show the above inference as invalid is by using Venn diagrams.

In logical parlance, the inference is invalid, since under at least one interpretation of the predicates it is not validity preserving.

In this way, the deductive fallacy is formed by points that may individually appear logical, but when placed together are shown to be incorrect.

A Euler diagram illustrating a fallacy:
Statement 1: Most of the green is touching the red.
Statement 2: Most of the red is touching the blue.
Logical fallacy: Since most of the green is touching red, and most of the red is touching blue, most of the green must be touching blue. This, however, is a false statement.