Definition:Tetrad
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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