Carl_Theodore_Heisel Knowpia

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 edit

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 edit

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

[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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