Uploaded May 2021 | Updated September 2026, 9 hours ago
🧠 What is logic, really—and how does it help you think better?
In this video, we break down the basics of propositional logic, quantifier logic, and modal logic in a clear, beginner-friendly way. You’ll learn how arguments are structured, what makes them valid or invalid, and how different logical systems help us evaluate reasoning.
We walk through:
--Common argument forms in propositional and quantifier logic
--How to understand conditionals and biconditionals
---The basics of modal logic (possibility and necessity)
--Why logic matters for analyzing real arguments
--If you want a solid foundation in logic without the jargon, this is a great place to start.
⚠️ Note:
The two invalid quantifier argument forms are mislabeled in the “similar to…” column:
The first corresponds to denying the antecedent.
The second corresponds to affirming the consequent.
📚 Related videos:
--Validity explained: youtu.be/cGWhb722si8
--Truth & propositions: youtu.be/goXSgSZNmvs
⏱️ Timestamps:
0:00 Intro (logic, arguments, validity)
3:46 Propositional logic argument forms
9:50 Conditionals
14:28 Biconditionals
16:44 Quantifier logic
21:23 Modal logic
28:14 Book recommendations & summary
🙏 Acknowledgment:
Thanks to Johnny Waldrop for helpful feedback on the slides.
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Check out my website: http://liz-jackson.com
For more on my research: liz-jackson.com/research/
For popular-level interviews, podcasts, and blog posts I’ve done: http://liz-jackson.com/public-philoso...
Follow me on social media:
Twitter: twitter.com/lizjackson111
Instagram: @lizjackson111
Facebook: facebook.com/lizjackson111/
🧠 What is logic, really—and how does it help you think better?
In this video, we break down the basics of propositional logic, quantifier logic, and modal logic in a clear, beginner-friendly way. You’ll learn how arguments are structured, what makes them valid or invalid, and how different logical systems help us evaluate reasoning.
We walk through:
--Common argument forms in propositional and quantifier logic
--How to understand conditionals and biconditionals
---The basics of modal logic (possibility and necessity)
--Why logic matters for analyzing real arguments
--If you want a solid foundation in logic without the jargon, this is a great place to start.
⚠️ Note:
The two invalid quantifier argument forms are mislabeled in the “similar to…” column:
The first corresponds to denying the antecedent.
The second corresponds to affirming the consequent.
📚 Related videos:
--Validity explained: youtu.be/cGWhb722si8
--Truth & propositions: youtu.be/goXSgSZNmvs
⏱️ Timestamps:
0:00 Intro (logic, arguments, validity)
3:46 Propositional logic argument forms
9:50 Conditionals
14:28 Biconditionals
16:44 Quantifier logic
21:23 Modal logic
28:14 Book recommendations & summary
🙏 Acknowledgment:
Thanks to Johnny Waldrop for helpful feedback on the slides.
-----------------------------------------------------------------------
Check out my website: http://liz-jackson.com
For more on my research: liz-jackson.com/research/
For popular-level interviews, podcasts, and blog posts I’ve done: http://liz-jackson.com/public-philoso...
Follow me on social media:
Twitter: twitter.com/lizjackson111
Instagram: @lizjackson111
Facebook: facebook.com/lizjackson111/
