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Browse High School Sets
Stars indicate particularly interesting answers or good places to begin browsing.

Selected answers to common questions:
    Venn diagrams.

Sets, Injection, and Surjections [12/04/1998]
If S is a set, such that every injection A from S to S is also a surjection, does S have the property that every surjection A from S to S is also an injection?


Stirling Numbers [05/26/1999]

Subsets and Greatest Common Divisor [03/26/1999]

Subsets and Proper Subsets [07/10/1998]
What is the difference between a subset and a proper subset?



Sum of Set Numbers [07/02/2001]
a_1, a_2, a_3,....a_15 are positive real numbers... what is the smallest possible value of the largest of a_1, a_2, a_3...a_15?

Total Membership [08/20/1999]

Transfinite Arithmetic [10/28/1997]

Transfinite Numbers [11/07/1997]

Truth Table [04/14/1999]
Prove that the complement of X intersects Y = X' union Y' without using a Venn diagram.

Types of Numbers [10/30/1998]


Unions and Intersections [05/10/1999]
How are the union and intersection of sets related?


Universal Sets [08/19/2002]
If I had to place the President of the U.S. in three universal sets, what are some possibilities?


Venn Complications Set In [01/04/2013]
A student struggles to draw a Venn diagram that represents the union and intersection of three sets or their complements. Before walking through an illustrated example, Doctor Peterson shows how to take apart such problems, then concludes with how to check your work.



Venn Diagram of Natural Numbers [09/22/1999]


Venn Diagram to Classify Quadrilaterals [01/02/2003]

What is a Loop? [10/06/1997]
Further, exactly what is _an_ algebra? Thirdly, what is a Lie group?

What is a Subset? [10/13/2001]
I would like to know what a subset is.



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