Tag Archives: Cool Graphs

A Cool Math Blog

Matt Henderson of Cambridge (UK) has a terrific math blog that is full of very cool animations. Here is an example, showing that the infinite geometric series 1/4 + 1/16 + 1/64 + … adds to 1/3: His latest post … Continue reading

Posted in Fun, Graphic Presentation, Math | | 2 Comments

Derivative of the Quotient: Lost in Translation?

I posted a while ago about an alternate way to calculate the derivative of a quotient. Suppose G and H are functions of one or more variables.  For F = G/H, the standard form of the first derivative is: F’ … Continue reading

Posted in Math | | 3 Comments

Puzzle #3: A Better Answer

Puzzle #3 asked for the weighted average life (“WAL”) of the principal payments for a 30-year mortgage that is cut short by a balloon payment at 15 years. The following information was provided: \$100,000 Principal; 5% Interest Rate; \$536.82 Level … Continue reading

Posted in Fun, Math, Puzzles | | 5 Comments

Advances in the Developing World, and in Graphics

In a talk by Marc Faber that I attended recently, he showed how quickly the developing world has advanced economically, and he argued that it should not be ignored by investors. In this entertaining talk Hans Rosling, a Swedish doctor … Continue reading

Puzzle #2: Answers to Follow-up Questions

Puzzle #2 asked how a \$6 million mortgage pool with a weighted average LTV of 80% could have a total property value of \$9 million when the average LTV implies a value of \$7.5 million. Chun Lee NG gave a good general … Continue reading

Posted in Fun, Math, Mortgage-Backed Securities, Puzzles | | 2 Comments