Four-momentum

Rarity: Uncommon

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Notion

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Science and technology

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What Wikipedia says

In special relativity, four-momentum (also called momentum–energy or momenergy) is the generalization of the classical three-dimensional momentum to four-dimensional spacetime. Momentum is a vector in three dimensions; similarly four-momentum is a four-vector in spacetime.

Excerpt from the Wikipedia article “Four-momentum”, under the CC BY-SA 4.0 license. Read the article on Wikipedia