Subset/Examples/Abstract Example 1

Example of Subset

Let $P$ denote the set:

$P = \set {1, 2, 3, 4}$

Let $Q$ denote the set:

$Q = \set {2, 4}$

Then:

$Q \subseteq P$

but note that:

$Q \notin P$

Sources

• 1977: K.G. Binmore: Mathematical Analysis: A Straightforward Approach ... (previous) ... (next): $\S 1$: Real Numbers: $\S 1.1$: Set Notation