Starting today, I will be summarizing all the posts in this blog at the end of each month. I will be calling the summary Month in Review.

For January 2013, below is the list of posts in case you missed one.

1. The Sum of the First n Positive Integers
2. The Power Law of Logarithms
3. The Quotient of Logarithm of A and Logarithm of B
4. Proof that Vertical Angles Are Congruent
5. A Geometric Proof of an Infinite Series
6. Algebraic Proof: Diagonals of a Parallelogram Bisect Each Other
7. Proof that Isosceles Trapezoids Have Congruent Base Angles
8. 5 Help Tools for Learning Mathematical Proofs

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