Fall 1999/ Spring 2000 Discrete Postage stamp to show that:
NOT(Magic(Postage Stamp Induction))

The basic idea: Write down the multiples of each postage value in two adjacent columns. There will be a place where there is only a 1 cent difference between the columns, in favor of the 1st column. There will be a 2nd place where there is a one cent difference between the columns, in favor of the 2nd column.
  1. Shopping with 7/11 cent postage slide #1 showing that the basis is less than the 65 cents. Its 62 cents.

  2. Shopping with 7/11 cent postage slide #2 continuing the effort to show why the two cases and postage stamp proofs are NOT MAGIC.

  3. Shopping with 7/11 cent postage slide #3 starts the proof, finally. The BASIC step is on this page.

  4. Shopping with 7/11 cent postage slide #4 contains the INDUCTIVE STEP of the proof. Note the a, b, c structure and the two different cases, b >= 5 and b < 5.