| 1. | Where \ delta ( t ) is the Dirac delta function.
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| 2. | The charge density is not actually concentrated in a delta function.
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| 3. | Where is the ordinary one-dimensional Dirac delta function.
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| 4. | The Dirac delta function can be rigorously defined either as a measure.
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| 5. | Higher derivatives of the delta function are known in physics as multipoles.
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| 6. | The delta functions themselves aren't square integrable either.
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| 7. | This'surface delta function'has the following property:
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| 8. | This is the Dirac equation for a delta function source in spacetime.
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| 9. | For example it is not meaningful to square the Dirac delta function.
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| 10. | Where \ delta _ k is the Kronecker delta function.
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