Quine's objections to modal logic 3 - extensionality and intensionality

From a channel Lumen includes in full: Kane B, a philosophy PhD, gives long, rigorous lectures on metaphysics, epistemology, logic and ethics, reconstructing arguments from the literature step by step and assessing their premises.

A 20-minute video from Kane B's catalogue; the title names its topic.

Video by Kane B, played through YouTube's embedded player.