For instance, the following seems obvious but I don't know how to state the proof formally (and directly):(adsbygoogle = window.adsbygoogle || []).push({});

Show [tex]A \cap (B-A) = \{\} [/tex]

Here is a try:

For any [tex]x \in U \ if \ x \in A[/tex] then [tex] x \notin (B-A)[/tex]

therefore [tex] A \cap (B-A) = \{\} [/tex]

there is something missing....

**Physics Forums - The Fusion of Science and Community**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# How do you prove things with null

Loading...

Similar Threads - prove things null | Date |
---|---|

I Prove if x + (1/x) = 1 then x^7 + (1/x^7) = 1. | Mar 9, 2016 |

I Proving Odd and Even | Feb 13, 2016 |

How many ways can you arrange 52 things into 4 groups BUT th | Dec 15, 2015 |

Prove A.(B+C) = (A.B)+(A.C) <Boolean Algebra> | Oct 24, 2015 |

**Physics Forums - The Fusion of Science and Community**