Carl Theodore Heisel (1852–1937)[1] was a mathematical crank who wrote several books in the 1930s challenging accepted mathematical truths. Among his claims is that he found a way to square the circle. He is credited with 24 works in 62 publications.[2] Heisel did not charge money for his books; he gave thousands of them away for free. Because of this, they are available at many libraries and universities. Heisel's books have historic and monetary value.[3] Paul Halmos referred to one of Heisel's works as a "classic crank book."[4]

Selected works

  • Heisel, Carl Theodore (1934). Mathematical and geometrical demonstrations, disproving numerous theorems, problems, postulates, corolleries, axioms naturally growing out of the extraordinary discoveries of a lacking link (2d. ed.). Cleveland.

References

  1. ↑ "Carl Theodore Heisel (1852–1937)". Find a Grave. Retrieved 31 May 2019.
  2. ↑ "WorldCat Listing". Retrieved 16 May 2019.
  3. ↑ Simanek, Donald E. "Carl Theodore Heisel Squares the Circle". lockhaven.edu. Archived from the original on 26 February 2021. Retrieved 23 May 2019.
  4. ↑ Paul R. Halmos (1970). "How to Write Mathematics". L'Enseignement mathématique. 16 (2): 123–152. – How to Write Mathematics
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