Francis Guthrie: A Colourful Life

@article{Maritz2012FrancisG,
  title={Francis Guthrie: 
A Colourful Life},
  author={P. Maritz and Sonja Mouton},
  journal={The Mathematical Intelligencer},
  year={2012},
  volume={34},
  pages={67-75}
}
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Four colors suffice!
TLDR
This column is a review of the recent book "Four colors suffice" by Robin Wilson that might interest the readers of this column since its almost three decades since the result was proven by Appel and Haken.
Four Colors Suffice: How the Map Problem Was Solved
On October 23, 1852, Professor Augustus De Morgan wrote a letter to a colleague, unaware that he was launching one of the most famous mathematical conundrums in history--one that would confound
Ericas in Southern Africa
Ericas in Southern Africa , Ericas in Southern Africa , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
9. Note on the Colouring of Maps
From the Proceedings of the Royal Society of Edinburgh, No. 106, p. 501, it appears the colouring of maps is receiving attention. This note bears chiefly upon the history of the matter. Some thirty