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What is the fundamental theorem?

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The term "fundamental theorem" can refer to several important results across different fields of mathematics and science. Below are a few of the most prominent ones:

### 1. Fundamental Theorem of Algebra
This theorem states that every non-constant polynomial equation with complex coefficients has at least one complex root. In other words, if you have a polynomial of degree \( n \), it will have exactly \( n \) roots (counting multiplicities) in the complex number system.

**Significance:**
- This theorem ensures that polynomial equations can be solved in the complex number system, leading to deeper insights in various areas of mathematics.

### 2. Fundamental Theorem of Calculus
This theorem connects differentiation and integration, two central concepts in calculus. It consists of two parts:

- **Part 1:** If \( f \) is a continuous real-valued function defined on the interval \([a, b]\), and \( F \) is an antiderivative of \( f \) on that interval, then:
  \[
  \int_a^b f(x) \, dx = F(b) - F(a)
  \]
- **Part 2:** If \( f \) is continuous on an interval \([a, b]\), then the function \( F \) defined by:
  \[
  F(x) = \int_a^x f(t) \, dt
  \]
  is continuous on \([a, b]\), differentiable on \((a, b)\), and \( F'(x) = f(x) \).

**Significance:**
- This theorem provides a way to evaluate definite integrals and illustrates the relationship between integration and differentiation.

### 3. Fundamental Theorem of Arithmetic
This theorem states that every integer greater than 1 can be uniquely represented as a product of prime numbers, up to the order of the factors. For example, \( 28 = 2^2 \times 7 \) is the unique prime factorization of 28.

**Significance:**
- It forms the foundation of number theory and is crucial for understanding the properties of numbers and their divisibility.

### 4. Fundamental Theorem of Galois Theory
This theorem establishes a correspondence between the field extensions of a polynomial and the group of its symmetries (the Galois group). Specifically, it describes how the roots of a polynomial are related to the group of automorphisms of the field extension.

**Significance:**
- It provides a profound connection between algebra and geometry and helps classify polynomial equations based on their solvability.

### 5. Fundamental Theorem of Linear Programming
This theorem states that if a linear programming problem has a solution, then at least one of the optimal solutions occurs at a vertex (corner point) of the feasible region defined by the constraints.

**Significance:**
- It is essential in operations research and optimization, providing a method for finding optimal solutions in linear programming problems.

### Conclusion
Each of these fundamental theorems plays a crucial role in their respective areas, providing essential insights and tools for further exploration and applications in mathematics and engineering. If you're interested in a specific fundamental theorem or its applications, let me know!
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The term "Fundamental Theorem" can refer to several important theorems in different areas of mathematics, but I'll cover a few of the most prominent ones:

### 1. **Fundamental Theorem of Calculus**

This theorem connects the concept of the derivative of a function with the concept of the integral. It has two main parts:

- **Part 1:** If \( f \) is a continuous real-valued function on an interval \([a, b]\), and \( F \) is an antiderivative of \( f \) (that is, \( F' = f \)), then:
  \[
  \int_a^b f(x) \, dx = F(b) - F(a)
  \]
  This part shows that the integral of \( f \) over \([a, b]\) can be computed using any antiderivative \( F \) of \( f \).

- **Part 2:** If \( f \) is a real-valued function defined on \([a, b]\), and \( F \) is defined by:
  \[
  F(x) = \int_a^x f(t) \, dt
  \]
  where \( x \) is in \([a, b]\), then \( F \) is continuous on \([a, b]\), differentiable on the open interval \((a, b)\), and:
  \[
  F'(x) = f(x)
  \]
  This part ensures that differentiation and integration are inverse processes.

### 2. **Fundamental Theorem of Algebra**

This theorem states that every non-constant polynomial equation with complex coefficients has at least one complex root. In other words, if \( p(x) \) is a polynomial of degree \( n \) with complex coefficients, then there is at least one complex number \( z \) such that \( p(z) = 0 \). This theorem guarantees that the field of complex numbers is algebraically closed.

### 3. **Fundamental Theorem of Arithmetic**

This theorem asserts that every integer greater than 1 can be factored uniquely into prime numbers, up to the order of the factors. For example, \( 30 = 2 \times 3 \times 5 \). This uniqueness is foundational in number theory and underpins many aspects of mathematics.

### 4. **Fundamental Theorem of Galois Theory**

This theorem establishes a correspondence between the subfields of a field extension and the subgroups of the Galois group of the extension. Specifically, it shows that there is a one-to-one correspondence between the intermediate fields of a field extension \( K \) over \( F \) and the subgroups of the Galois group of \( K \) over \( F \), providing a deep connection between field theory and group theory.

These theorems are foundational in their respective areas, providing crucial insights and tools for further exploration and application. If you have a specific field in mind, I can provide more detailed information about the relevant fundamental theorem.
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