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Recent Posts
 My Letter to the Wall Street Journal
 Quarter the Cross: An Elegant Construction
 Quarter the Cross
 My FT Alphaville Commentary on Managing U.S. Treasury Debt
 NAMA in NOLA
 Taming Premium Bonds
 Fifth Annual Municipal Finance Conference
 Generating Sitemap Links with Excel
 Spaghetti Puzzle #1
 A Mathematician’s New Year’s Resolutions
Top Posts & Pages
 Fast Formulas #1: Average Life of Mortgage (as Scheduled)
 Puzzle #2: Weighted Average LTV
 Fast Formulas #3: Pool Average Life with CPR Prepayments
 Fast Formulas #2: Average Life of Mortgage (Amortizing with Balloon)
 The National Debt is Closer than it May Appear
 Puzzle #2: Answers to Followup Questions
 Fast Formulas #5: QuasiGeometric Series (The Other Trick)
 Good Fences Make Good Spreadsheets, Part 1
 Economics
 Fast Formulas #4: Geometric Series (One of the Tricks)
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Tag Archives: Matt Henderson
Fast Formulas #4: Geometric Series (One of the Tricks)
In Fast Formulas #3: Pool Average Life with CPR Prepayments, I presented Formula 3.1, a shortcut calculation for the average life of a loan pool under a constant prepayment assumption. I mentioned that Formula 3.1 was derived by using “a … Continue reading
Posted in Fast Formulas, Math
Tagged David Hilbert, Fast Formulas, Geometric Series, Math, Matt Henderson
5 Comments
A New(?) Way to Visualize Numbers
After I saw Matt Henderson’s visual demonstration of how the geometric series 1/4 + 1/16 + 1/64 . . . adds to 1/3, I thought about how to generalize this for any geometric series. This led to a way to … Continue reading
Posted in Fun, Graphic Presentation, Math, Visualization
Tagged Georg Cantor, Matt Henderson, Pi, Pure Math, Representing Numbers, Visualizing Numbers
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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
Tagged Chaos, Cool Graphs, Geometric Series, Matt Henderson
2 Comments