the Nine Dot Problem, where you are asked to connect the following 3 by 3 grid of black dots using only four lines:
The problem (as described) is trivial—it’s missing a constraint. From the article linked:
The task is to connect all 9 dots using exactly 4 straight lines, without retracing or removing one’s pen from the paper.
Oops, I fixed that in my blog version and then accidentally posted the old draft here. Edited now, thank you!
The problem (as described) is trivial—it’s missing a constraint. From the article linked:
Oops, I fixed that in my blog version and then accidentally posted the old draft here. Edited now, thank you!