Working Foundations
- Peano axioms
- Giuseppe Peano
 
 - Mathematical induction
- Structural induction
 - Recursive definition
 
 - Naive set theory
- Element (mathematics)
- Ur-element
 
 - Singleton (mathematics)
 - Simple theorems in the algebra of sets
 - Algebra of sets
 - Power set
 - Empty set
 - Non-empty set
 - Empty function
 
 - Element (mathematics)
 - Universe (mathematics)
 - Axiomatization
 - Axiomatic system
- Axiom schema
 
 - Axiomatic method
 - Formal system
 - Mathematical proof
- Direct proof
 - Reductio ad absurdum
 - Proof by exhaustion
 - Constructive proof
 - Nonconstructive proof
 
 - Tautology
 - Consistency proof
 - Arithmetization of analysis
 - Foundations of mathematics
 - Formal language
 - Principia Mathematica
 - Hilbert's program
 - Impredicative
 - Definable real number
 - Algebraic logic
- Boolean algebra (logic)
 
 - Dialectica space
 - categorical logic
 
Read more about this topic: List Of Mathematical Logic Topics
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