Monthly Archives: December 2010

12 Days of Christmas

Nice problem and solution at squarecirclez about counting the total number of presents. Triangular numbers appears! It seems that this year’s Simpsons Christmas special was a live action parody/tribute to Sesame Street and the Muppets. It had them singing the … Continue reading

Posted in Calculus/Analysis, Fun Stuff, Number Theory, Problems, Teaching, Technology | Leave a comment

Greenhouse effect

I learnt from an article of Martin Walter from the November issue of the Notices of AMS 2010 that it was Fourier who created the term “greenhouse effect.”

Posted in Applications, General, Quotes/People | Leave a comment

Simple algebra*

In the midst of grading exams now. One problem consists of computing determinants and many students give the answer [tex] (1+a)^3 -3a -1 [/tex] without simplifying it to [tex] a^3+3a^2 [/tex]. I have this nagging suspicion that they are not … Continue reading

Posted in Algebra, Linear Algebra, Teaching | Leave a comment