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Tag Archives: finite
Ways to prove a bijection
You have a function and want to prove it is a bijection. What can you do? By the book A bijection is defined as a function which is both onetoone and onto. So prove that is onetoone, and prove that … Continue reading
Posted in logic, proof
Tagged bijection, finite, function, injection, invertible, onetoone, onto, proof, surjection
7 Comments
MaBloWriMo 15: One more fact about element orders
I almost forgot, but there is one more fact about the order of elements in a group that we will need. Suppose we have some and we happen to know that is the identity. What can we say about the … Continue reading
Posted in algebra, group theory, number theory, proof
Tagged elements, finite, groups, MaBloWriMo, order
1 Comment
MaBloWriMo 14: Element orders are no greater than group size
Today we will give an answer to the question: What is the relationship between the order of a group and the orders of its elements? Yesterday, I claimed we would prove that for any element of a group , it … Continue reading
Posted in algebra, group theory, proof
Tagged elements, finite, groups, MaBloWriMo, order
2 Comments
MaBloWriMo 13: Elements of finite groups have an order
Recall from yesterday that if is a group and is some element of the group, the order of is defined as the smallest number of copies of which combine to yield the identity element. I forgot to mention it yesterday, … Continue reading
Posted in algebra, group theory, proof
Tagged elements, finite, groups, MaBloWriMo, order
Comments Off on MaBloWriMo 13: Elements of finite groups have an order