| 1. | The action then is proportional to the curvature of the world line.
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| 2. | All curves through point p have a tangent vector, not only world lines.
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| 3. | For world lines of photons passing the origin in different directions and holds.
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| 4. | Hundreds of cookbooks from around the world line his office and hallway walls.
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| 5. | A world line traces out the path of a single point in spacetime.
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| 6. | The red lines represent world lines in newtonian space and time.
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| 7. | Geometrically, "'U "'is a normalized vector tangent to the world line of the particle.
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| 8. | The idea of world lines originates in physics and was pioneered by Hermann Minkowski.
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| 9. | The history of an object traces a curve in spacetime, called its world line.
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| 10. | The idea is based on the world lines traced out across spacetime by every electron.
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