- #1

Piffo

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## Homework Statement

Prove that A intersection B is a subset of A union B without using Venn diagrams

## Homework Equations

No relevant equations really

## The Attempt at a Solution

What i am thinking is this:

A union B = A+B- A intersection B shows the intersection is within the union

So A intersection B = -A union B +A+B, which tells me the intersection is smaller than the union.

Can anybody give me some feedback please?