Moment of Sum of Couples is Vector Sum of Moments

Theorem

Let $C_1$ and $C_2$ be couple.

The sum of $C_1$ and $C_2$ is a third couple whose moment is the sum of the moments of $C_1$ and $C_2$.

Proof

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Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): couple
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): couple