Subset/Examples/Romeo and Juliet

Example of Subset

Let $B$ denote the set:

$B := \set {\textrm {Romeo}, \textrm {Juliet} }$

Let $D$ denote the set:

$D := \set {y: \text {$y$ loves Romeo} }$

Then:

$B \subseteq D$

presuming, of course, that Romeo actually loves himself, which may be doubted considering he took his own life.

Sources

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