Yoshida' stance on PL and why it is less than ideal.

[Issac]

That's called the transitive property. It isn't an argument, it's mathematical fact.

I don't understand the context you used this statement in, but... If A=B, and B=C, then A=C. It isn't debatable.

It's called a fallacy.

Straw man
Straw man: A straw man argument is an informal fallacy based on misrepresentation of an opponent's position.
Example
Person A: Sunny days are good.
Person B: If all days were sunny, we'd never have rain, and without rain, we'd have famine and death. Therefore, you are wrong.
Problem: B has misrepresented A's claim by falsely suggesting that A claimed that only sunny days are good, and then B refuted the misrepresented version of the claim, rather than refuting A's original assertion.
http://en.wikipedia.org/wiki/Fallacy