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Category Archives: Puzzles
Spaghetti Puzzle #1
About a month ago, math educator Marilyn Burns tweeted this puzzle: Here's a problem I've thought about for a long time. Not making progress, but I'm still fascinated. Help? pic.twitter.com/r6iagNUn76 — Marilyn Burns (@mburnsmath) December 6, 2015 Spoiler Alert: … Continue reading
Posted in Fun, Puzzles
Tagged Calculus, Ivan Moscovich, Probability, Spaghetti Puzzle, Walking Stick Puzzle
6 Comments
Puzzle #11: The Answer (PiFingered Aliens)
I posted Puzzle #11 on Pi Day (3/14/15 in the U.S.). I noted that the sequence of numbers in 3.14159… reflects not just π, but also ten, the base we use for our numbers. The question was: What is 30.12120111…? After no … Continue reading
Puzzle #11: A Pi Day Problem
I thought of this Pi Day puzzle yesterday* while getting a haircut. I was thinking about this video by Vi Hart: Many people think that π is special because of its infinite digits. Hart disagrees. Most numbers are irrational like π, … Continue reading
Puzzle #10: The Answer
The challenge posed by Puzzle #10: Erratic Bond Pricing? was to guess what might be the cause of apparently wild swings in market yields for some municipal bonds with the same issuer and maturity: Besides this blog, I shared the … Continue reading
Posted in Bonds, Puzzles
Tagged Bond Puzzle, Municipal Bonds, Municipal Finance Conference, Puzzle
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Puzzle #10: A Hint
Puzzle #10: Erratic Bond Pricing? asks you what might explain some apparently erratic swings in yields for certain sporadically traded municipal bonds. I stated that the bonds share the same issuer and maturity date. The puzzle is a bit sneaky, so … Continue reading
Posted in Bonds, Puzzles
Tagged Bond Puzzle, Municipal Bonds, Municipal Finance Conference, Puzzle
8 Comments
Puzzle #10: Erratic Bond Pricing?
At last week’s Municipal Finance Conference in Boston, I made a brief presentation in response to a paper1 that described a new approach to deriving yield curves from municipal bond trade data. The authors have applied neural network techniques to the … Continue reading
Posted in Bonds, Puzzles
Tagged Bond Puzzle, Municipal Bonds, Municipal Finance Conference, Puzzle
15 Comments
Puzzle #9 (Followup): Melting Fractals
The song “Let it Go” from the movie Frozen celebrates “frozen fractals.” I suppose a frozen fractal is something like the Koch snowflake. Lately, though, one of my puzzles has made me more interested in melting fractals. The challenge of Puzzle … Continue reading
Posted in Fun, Graphic Presentation, Math, Puzzles, Visualization
Tagged Big Data, Fractals, Latin Hypercube Sampling, Latin Squares, MATLAB, Sierpinski Tetrahedron
2 Comments