Definition:Tetrad

Definition

A tetrad is a set or tuple which has exactly $4$ elements.

Also defined as

The term tetrad can also be seen defined as a power of $10 \, 000$, which is itself a power of $4$.

Linguistic Note

The word tetrad derives from the Classical Greek τέτταρες (téttares) and τέσσαρες (téssares), meaning four.

Sources

• 1989: Ephraim J. Borowski and Jonathan M. Borwein: Dictionary of Mathematics ... (previous) ... (next): tetrad