# Set Theory Proof with the Math Sorcerer | Summary and Q&A

18.7K views
January 27, 2019
by
The Math Sorcerer
Set Theory Proof with the Math Sorcerer

## TL;DR

This video provides a step-by-step proof showing that the intersection of two sets is contained in one of the sets, and that one set is contained in the union of two sets.

## Key Insights

• 📼 The video provides a clear step-by-step proof for the containment of the intersection in one set.
• 😫 It also demonstrates a proof for the containment of one set in the union of two sets.
• 🧑‍🏭 Specific language and definitions are used strategically to emphasize important facts and steps.
• 🇪🇺 The proofs rely on logic and the definitions of intersection and union.
• 🫵 The video aims to help viewers understand and apply these proof techniques.
• 🧑‍🏭 Emphasizing specific facts and conditions helps to solidify the precise definitions of the intersection and union.
• ❓ The proofs rely on the inclusive nature of the "or" operator in mathematics.

## Transcript

hey what's up and this probably gonna prove that ain't intersection B is contained in a which is also contained an age Union B okay let's go ahead and go through by showing the first inclusion will show that a intersection B is contained in a okay so to do that we'll take a compliment intersection B and we'll show what's also okay so if you can sho... Read More

### Q: What is the main objective of this video?

The main objective of this video is to demonstrate and explain the proof that the intersection of two sets is contained in one of the sets, and that one set is contained in the union of two sets.

### Q: How is the containment of the intersection in one set proven?

The containment of the intersection in one set is proven by taking the complement of the intersection with the other set and showing that every element in the complement is also in the first set.

### Q: How is the containment of one set in the union proven?

The containment of one set in the union is proven by showing that any element in the set is either in the first set, or in the second set, or in both, which is precisely the definition of the union.

### Q: What role does specific language play in the proofs?

Specific language is used to emphasize and clarify the key concepts and steps of the proofs. It helps to clearly communicate what is being proven and why each step is taken.

## Summary & Key Takeaways

• The video explains how to prove that the intersection of two sets is contained in one of the sets.

• It also demonstrates the proof that one set is contained in the union of two sets.

• Specific language and definitions are used to emphasize the key concepts and steps of the proofs.