Friedrich Haag (20 August 1856 – 8 December 1941) was a pioneering German crystallographer.[1][2]

An article written by Haag in the de:Zeitschrift für Kristallographie (a German crystallography journal) was used by M. C. Escher in his study of tessellation.[3][4]

References

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  1. ^ "H. Wondratschek Topics, The Rigaku Journal, Volume 4, Issue 1/2, 1987, p. 33" (PDF). Archived from the original (PDF) on 2016-03-03. Retrieved 2015-11-05.
  2. ^ Doris Schattschneider Tiling the plane with congruent pentagons, Math. Mag., 1978, Volume 51, pp. 29–44[permanent dead link]
  3. ^ Haag Die regelmäßigen Planteilungen und Punktsysteme, Zeitschrift für Kristallographie, Volume 58, 1923, pp. 478–489[permanent dead link]
  4. ^ Doris Schattschneider The Mathematical Side of M. C. Escher, Notices AMS, June/July 2010, p. 707
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