Quantum mechanics is the branch of physics that studies the behavior of matter and energy in the presence of an observer. It is the foundation of modern physics and the theory of the wave-particle duality.

The axioms of quantum mechanics are:

1. The wave function is a mathematical description of the state of a quantum system.

2. The wave function evolves in time according to the Schrödinger equation.

3. Measurements of physical quantities are represented by operators acting on the wave function.

4. The wave function encodes the probabilities of the outcomes of measurements.

5. The evolution of the wave function is continuous but irreversible.

6. Quantum systems can be in superpositions of states.

7. Entanglement is a property of quantum systems.

8. The wave function is complete.

## Other related questions:

### Q: What are the three principles of quantum mechanics?

A: The three principles of quantum mechanics are the Heisenberg uncertainty principle, the Born rule, and the Schrödinger equation.

### Q: What are axioms in physics?

A: There is no definitive answer to this question as it depends on the particular theory or framework within physics that one is working with. However, in general, axioms are simply assumptions or postulates that are taken to be true without needing to be proven. These axioms then form the basis from which other results or theorems can be derived.

### Q: How many postulates are there in quantum mechanics?

A: There are four postulates in quantum mechanics: the postulates of wave-particle duality, of quantum superposition, of measurement, and of entanglement.

### Q: Which is the 5th postulate of quantum mechanics?

A: The fifth postulate of quantum mechanics is that the wave function is a complete description of the system.

## Bibliography

- The axioms of quantum mechanics – Book chapter – IOPscience
- Dirac–von Neumann axioms – Wikipedia
- What are the axioms in quantum mechanics? – Quora
- Axioms for Quantum Mechanics | SpringerLink
- Topics: Axioms for Quantum Theory – Ole Miss Physics
- Quantum Theory Rebuilt From Simple Physical Principles
- Essay on axioms of quantum mechanics – arXiv