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1.1. Introduction
to the foundation of mathematics

1.2. Variables, sets, functions and operations

1.3. Form of theories: notions, objects, meta-objects

1.4. Structures of mathematical systems

1.5. Expressions and definable structures

1.6. Logical connectives

1.7. Classes in set theory

1.8. Bound variables in set theory

1.9. Quantifiers

1.10. Formalization of set theory

1.11. Set generation principle

1.2. Variables, sets, functions and operations

1.3. Form of theories: notions, objects, meta-objects

1.4. Structures of mathematical systems

1.5. Expressions and definable structures

1.6. Logical connectives

1.7. Classes in set theory

1.8. Bound variables in set theory

1.9. Quantifiers

1.10. Formalization of set theory

1.11. Set generation principle

2.1. Tuples, families

2.2. Boolean operators on families of sets

2.3. Products, graphs and composition

2.4. Uniqueness quantifier

2.5. The powerset axiom

2.6. Injectivity and inversion

2.7. Properties of binary relations on a set ; ordered sets

2.8. Canonical bijections

2.9. Equivalence relations and partitions

2.10. Axiom of choice

2.11. Galois connections

2.2. Boolean operators on families of sets

2.3. Products, graphs and composition

2.4. Uniqueness quantifier

2.5. The powerset axiom

2.6. Injectivity and inversion

2.7. Properties of binary relations on a set ; ordered sets

2.8. Canonical bijections

2.9. Equivalence relations and partitions

2.10. Axiom of choice

2.11. Galois connections

3.1. Morphisms of relational systems and concrete categories

3.2. Algebras

3.3. Algebraic terms, integers and recursion

3.4. Mathematical theories and the Completeness Theorem

3.5. How mathematical theories develop

3.6. Second-order theories (updated, May 2015)

3.7. Formalizations of Arithmetic

3.8. Non-standard models of Arithmetic

3.9. The Incompleteness Theorem

More philosophical notes : 3.2. Algebras

3.3. Algebraic terms, integers and recursion

3.4. Mathematical theories and the Completeness Theorem

3.5. How mathematical theories develop

3.6. Second-order theories (updated, May 2015)

3.7. Formalizations of Arithmetic

3.8. Non-standard models of Arithmetic

3.9. The Incompleteness Theorem

About the powerset axiom

Philosophical proof of consistency of the Zermelo-Fraenkel axiomatic system (uses Part 1 with philosophical aspects + recursion)

Philosophical proof of consistency of the Zermelo-Fraenkel axiomatic system (uses Part 1 with philosophical aspects + recursion)

(List of texts on algebra)

The Galois
connection between structures and permutations (Automorphisms, Invariants)

Introduction to categories

Monoids and groups

Actions of monoids and groups

Introduction to the foundations of geometry

Introduction to categories

Monoids and groups

Actions of monoids and groups

Introduction to the foundations of geometry

What is geometry

Structures and permutations in the plane

Affine geometry

Beyond affine geometry

Euclidean geometry

The completeness of first-order geometry

Structures and permutations in the plane

Affine geometry

Beyond affine geometry

Euclidean geometry

The completeness of first-order geometry

General formalization tools (draft)

Products of systems

Varieties

Polymorphisms, invariants and clones of operations

Relational clones

Abstract clones

Rings

(To be continued - see below drafts)

Products of systems

Varieties

Polymorphisms, invariants and clones of operations

Relational clones

Abstract clones

Rings

(To be continued - see below drafts)

Monotone Galois connections (adjunctions)

Upper and lower bounds, infimum and supremum

Complete lattices

Fixed point theorem

Transport of closure

Preorder generated by a relation

Finite sets

Generated equivalence relations, and more

Well-founded relations

Dimensional analysis : Quantities and real numbers - incomplete draft text of a video lecture I wish to make on 1-dimensional geometry

Introduction to inversive geometry

Duality systems and theories

Affine geometry

Introduction to topology

Vector spaces in duality

Axiomatic expressions of Euclidean and Non-Euclidean geometries

Cardinals

Well-orderings and ordinals (with an alternative to Zorn's Lemma).

Introduction to inversive geometry

Duality systems and theories

Affine geometry

Introduction to topology

Vector spaces in duality

Axiomatic expressions of Euclidean and Non-Euclidean geometries

Cardinals

Well-orderings and ordinals (with an alternative to Zorn's Lemma).

Pythagorean
triples (triples of integers (a,b,c) forming the sides of a
right triangle, such as (3,4,5))

I wrote large parts of the Wikipedia article on Foundations
of mathematics (September 2012 - because until then,
other authors focused on the more professional and technical
article Mathematical
logic instead; the Foundations of mathematics article is
more introductory, historical and philosophical) and improved
the one on the completeness
theorem.