The Axiom of Choice is a fundamental concept in set theory that states that for any collection of non-empty sets, there exists a set that contains exactly one element from each of the sets in the collection.

First-Order Logic is a logical system that is used to study the foundations of mathematics. It is based on the idea of quantifiers, which allow us to make statements about all or some elements of a set.

Mathematical models can be physical, abstract, or computer models. Physical models are physical representations of mathematical concepts, such as a globe representing the Earth. Abstract models are mathematical structures that are used to represent real-world phenomena, such as a graph representing a network. Computer models are computer programs that are used to simulate real-world phenomena, such as a weather forecasting model.

The Least Upper Bound Property states that every non-empty set of real numbers has a least upper bound, which is also known as the supremum or the least element that is greater than or equal to every element in the set.

Logical fallacies are errors in reasoning that can lead to incorrect conclusions. Ad Hominem is an attack on the person making the argument rather than the argument itself. Straw Man is misrepresenting someone's argument in order to make it easier to attack. Begging the Question is assuming the conclusion of an argument in the premises.

Computability Theory, Complexity Theory, and Automata Theory are all mathematical fields that study the relationship between logic and computation. Computability Theory studies the limits of what can be computed, Complexity Theory studies the efficiency of computation, and Automata Theory studies abstract machines that can perform computations.

Direct Proof, Indirect Proof, and Constructive Proof are all types of mathematical proofs. Direct Proof proves a statement by showing that it is true. Indirect Proof proves a statement by showing that its negation leads to a contradiction. Constructive Proof proves a statement by exhibiting an object that satisfies the statement.

The Heine-Cantor Theorem states that every continuous function on a closed interval is uniformly continuous. This means that for any positive number $\epsilon$ there exists a positive number $\delta$ such that if $x$ and $y$ are any two points in the interval with $|x - y| < \delta$, then $|f(x) - f(y)| < \epsilon$.

Group, Ring, and Field are all types of mathematical structures. A group is a set with an operation that combines any two elements of the set to produce a third element of the set. A ring is a group with an additional operation that distributes over the first operation. A field is a ring in which every non-zero element has a multiplicative inverse.

The Bolzano-Weierstrass Theorem states that every bounded sequence of real numbers has a convergent subsequence. This means that there exists a subsequence of the sequence that converges to a limit.

Propositional Logic, Predicate Logic, and Modal Logic are all types of mathematical logic. Propositional Logic is the study of logical connectives, such as and, or, and not. Predicate Logic is the study of quantifiers, such as for all and there exists. Modal Logic is the study of modalities, such as necessity and possibility.

The Heine-Cantor Theorem states that every continuous function on a compact space is uniformly continuous. This means that for any positive number $\epsilon$ there exists a positive number $\delta$ such that if $x$ and $y$ are any two points in the space with $|x - y| < \delta$, then $|f(x) - f(y)| < \epsilon$.

Mathematical models can be physical, abstract, or computer models. Physical models are physical representations of mathematical concepts, such as a globe representing the Earth. Abstract models are mathematical structures that are used to represent real-world phenomena, such as a graph representing a network. Computer models are computer programs that are used to simulate real-world phenomena, such as a weather forecasting model.

The Least Upper Bound Property states that every non-empty set of real numbers has a least upper bound, which is also known as the supremum or the least element that is greater than or equal to every element in the set.

Logical fallacies are errors in reasoning that can lead to incorrect conclusions. Ad Hominem is an attack on the person making the argument rather than the argument itself. Straw Man is misrepresenting someone's argument in order to make it easier to attack. Begging the Question is assuming the conclusion of an argument in the premises.