This is with reference to J. Stillwell, The Four Pillars of Geometry (Springer, 2010), https://link.springer.com/book/10.1007/0-387-29052-4 .
Open Question 1
This is with reference to J. Stillwell, The Four Pillars of Geometry (Springer, 2010), https://link.springer.com/book/10.1007/0-387-29052-4 .
institute-theory-stem.org 