Carl Theodore Heisel

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. https://www.findagrave.com/memorial/21659237/carl-theodore-heisel. Retrieved 31 May 2019. Missing or empty |title= (help)
  2. http://www.worldcat.org/identities/lccn-no2002070146/. Retrieved 16 May 2019. Missing or empty |title= (help)
  3. Simanek, Donald E. "Carl Theodore Heisel Squares the Circle". lockhaven.edu. Retrieved 23 May 2019.
  4. Halmos, Paul. "How to Write Mathematics" (PDF). Retrieved 16 May 2019.


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