# Subset/Examples/Romeo and Juliet

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## 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