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Predicate Logic Proof Example 2: Using Instantiation and Generalization

Predicate Logic Proof Example 6: Using the Contradictory Premises Rule

The Purpose of Proof

Proof by Counterexample

Proofs in English: Taking the Training Wheels Off

Querium's StepWise Tool for Checking Formal Proofs - Part 4

Querium's StepWise Tool for Checking Formal Proofs - Part 3

Querium's StepWise Tool for Checking Formal Proofs - Part 2

Querium's StepWise Tool for Checking Formal Proofs - Part 1

Law of the Excluded Middle - Part 1

Law of the Excluded Middle - Part 2

Boolean Logic Proof Example 2: Using Disjunctive Syllogism

Predicate Logic Proof Example 5: Existential Instantiation and Generalization

Boolean Proof Example 1: Using Modus Ponens

Boolean Proof Example 4: Backward Reasoning Using Modus Tollens

Induction Proof Example 2

Boolean Proof Example 7: Using Contradictory Premises and Conditionalization

Induction Proof Example 1

Boolean Proof Example 3: Using Conditional Disjunction

Predicate Logic Proof Example 4: Using Quantifier Exchange

Predicate Logic Proof Example 3: Using Universal Instantiation

Boolean Proof Example 5: Using Conditionalization

Predicate Logic Proof Example 1: Using Universal Generalization

Boolean Proof Example 6: Conditionalization