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In physics, special relativity is the generally accepted and experimentally well-confirmed physical theory regarding the relationship between space and time. In Albert Einstein's original pedagogical treatment, it is based on two postulates:The laws of physics are invariant in all inertial systems.
The speed of light in a vacuum is the same for all observers, regardless of the motion of the light source.

### Origins and significance

### Traditional "two postulates" approach to special relativity

### Principle of relativity

### Lorentz invariance as the essential core of special relativity

### Consequences derived from the Lorentz transformation

### Optical effects

### Dynamics

### Relativity and unifying electromagnetism

### Theories of relativity and quantum mechanics

### Status

### Technical discussion of spacetime