4 ms·
I was confused as well, but I think the idea is that he's using only graph paper and a straightedge without measurement. (or markings) So he has to place point
by Timothee 8y ago
I was confused as well, but I think the idea is that he's using only graph paper and a straightedge without measurement. (or markings)
So he has to place points with integer coordinates on the graph paper, and draw lines between them.
- rocqua 8y agoThat's an interesting number set. The set of all points that can be produced from a straight-edge and the grid of integers. I'm pretty sure this is just the grid of rational numbers. Interestingly, this is a subset of the 'constructible' numbers. That is, the numbers that can be produced from a compass and straight-edge (without even needing a grid).
- joppy 8y agoIt’s not so surprising, since once you have a compass, straightedge, and a line segment you call “unit length”, you can construct all of the integer valued points in the plane.