Modal logic is the logic of possibility and necessity, past and future, knowledge and belief, and dynamic change. It's one of the most exciting areas of logic to learn, and one of the best for philosophers and linguists. In this tutorial video, we'll introduce the basics of modal logic, focusing on possibility and necessity, and set the stage for more in-depth tutorials. 00:00 - Intro 01:19 - What is modal logic? 02:12 - Modalities are intensional 02:41 - More modalities 02:56 - Temporal modalities 03:19 - Epistemic Modalities 05:51 - Modal language 07:34 - Modal Semantics 08:06 - Possible worlds 09:29 - Truth at a world 10:54 - Semantics for BOX and DIAMOND 11:56 - Examples 13:37 - Wrap-up More videos on modal logic coming next! If there’s a topic you’d like to see covered, leave me a comment below. Links: My academic philosophy page: http://markjago.net/ My book What Truth Is: http://bit.ly/JagoTruth Most of my publications are available freely here: https://philpapers.org/s/Mark%20Jago Get in touch on Social media! Instagram: https://www.instagram.com/AtticPhilosophy Twitter: https://twitter.com/PhilosophyAttic #logic #philosophy #possibility