The Schmidt Arrangement of the Gaussian integers.👇👇👇👇👇👇

The Schmidt Arrangement of the Gaussian integers.

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http://math.colorado.edu/~kstange/scripts.html

The Schmidt Arrangement of Q(sqrt(-2)).

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http://math.colorado.edu/~kstange/scripts.html

The Schmidt Arrangement of Q(sqrt(-7)).

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http://math.colorado.edu/~kstange/scripts.html

The Schmidt Arrangement of Q(sqrt(-11)).

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http://math.colorado.edu/~kstange/scripts.html

he Schmidt Arrangement of Q(sqrt(-15)).

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http://math.colorado.edu/~kstange/scripts.html

For other Schmidt arrangements, visit the folder of images:

http://math.colorado.edu/~kstange/arrangements/

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Joel David Hamkins is a mathematics professor at City University of New York. He is specialist in mathematical logic and set theory. His website contains a part entitled "Math for Kids".
the note ''Math for eight-year-olds: graph theory for kids!'' is very interesting .
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http://jdh.hamkins.org/category/math-for-kids/

A proof of the identity 1+2+⋯+(n−1)=C(n,2) 👇👇👇👇👇
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