Validity

Depths of understanding

1. 1

   Foundation

   You can test whether a conclusion follows by pretending the reasons are true and trying to imagine it false, and you know validity is about shape, not facts.

   • Watch · 34 sMust it be true?

   • Read itMust It Be True?Logic Level 1: Good Reasons
   • Read itGood Shape, Wrong FactsLogic Level 1: Good Reasons

   Opens after

   ArgumentValidity is about how an argument's reasons connect to its conclusion.
2. 2

   Deeper

   You recognize valid and invalid argument forms - like modus ponens and affirming the consequent - by their shape.

   • Watch · 36 sThe four moves

   • Read itThe Four MovesLogic Level 2: The Shape of an Argument

   Master depth 1 first

   Conditional statementsThe classic valid and invalid forms are built from "if... then" statements - learn conditionals, then come back.

Your path here

What's still between you and Validity, depth 1, in the order you can learn it.

1. 1ClaimDepth 1 · Foundation · Logic
2. 2ArgumentDepth 1 · Foundation · Logic
3. 3ValidityDepth 1 · Foundation · Logic