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Dozenal Society of America
Promoting base twelve and alternative base mathematics
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The Dozenal Society of America
The DSA is a voluntary, nonprofit education corporation, organized for the conduct of research and education of the public in the use of dozenal (also called duodecimal or base-twelve) in calculations, mathematics, weights and measures, and other branches of pure and applied science.

The Duodecimal Bulletin

◀️ Issue: Whole Number 71z (85d) | Vol. 36z (42d) No. 2 | Year 11A1z (1993d) ▶️



Click to view PDF

Editor: Prof. Jay Schiffman

Cover Title: Don Hammond, RIP

Contents:

  • Minutes of the Board of Directors Meeting | Gene Zirkel, Acting Secretary
  • Available from the Society
  • British Editor Passes (Don Hammond)
  • Announcement of Our Annual Meeting
  • Checking Arithmetic Computations: An Application of Modular Arithmetic | Jay L. Schiffman
  • The First 30z Powers of Two | Brian M. Dean
  • Find the Next Term! | Shaun Ferguson
  • A Cryptarithm
  • A New Approach to Symbols | George P. Jelliss
  • The Origin of the Asterisk and the Octothorpe | Gene Zirkel
  • Time Periods | Jean Kelly
  • Duodecimal Crossnumber Puzzle Solution | Jay L. Schiffman
  • Proving Identities by a Change of Base | Gene Zirkel
  • Dozenal Jottings | From Members and Friends
    • Henry Churchman passed away July 4, 1993d
    • New Member: Tegan Cheslack-Postava
  • Why Change?
  • Counting in Dozens