I was Dx'd with ADHD ten years ago.

Smoothness can vary from 0 (for a nondifferentiable function) to infinity (for a smooth function).

She took advantage of his desperation.

A week into the trip Korbel told me I was riding well, no trouble at all for him, so we would detour a little to the east, toward an oasis called Tongguzbasti. We would soon pick up a very old route, he told me, one that ran between the Khotan, which we had by then gained, and another riverbed, the Keriya. Along the way we would see something.