Subset/Examples/Subset of Alphabet

Example of Subset

Let $S$ denote the capital letters of the (English) alphabet:

$S = \set {A, B, C, D, \dotsc, Z}$

Then $\set {A, B, C}$ is a subset of $S$:

$\set {A, B, C} \subseteq S$

Sources

• 1974: Murray R. Spiegel: Theory and Problems of Advanced Calculus (SI ed.) ... (previous) ... (next): Chapter $1$: Numbers: Sets