Uploaded September 2020 | Updated September 2026, 3 hours ago

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This video is about the definition of knowledge. We first cover four types of beliefs: true, false, justified, and unjustified. Then, we talk about the JTB (justified true belief) theory of knowledge. Then, we talk about Gettier's objection to the JTB theory. Finally, we discuss knowledge-first epistemology.

For some of the theories of knowledge that tried to solve the Gettier problem, see:

youtu.be/VAt9h6PCnEg

youtu.be/3z8sDiaY65Y

youtu.be/lyE0xiMjaoI

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