Vivian began squinting the moment she explained. Okay, x and y. Like coordinates on a map. He'd seen those before, in cartographer's offices, and they used it to pinpoint areas. So if X represented longitude, and Y latitude...or was it the reverse...then this was plotting an area on a graph. He blinked. It was so convoluted but he had the fuzzy idea of what she was talking about. He didn't pretend to understand it. He had a cartographer explain it to him once when he was bent over the desk, and honestly it gave him something interesting to think about while he was working other than the obvious. But this five equalling where the line crossed the y coordinate? That went entirely over his head. Weren't they just trying to find the coordinates? Why should he care what line crossed where? Wasn't this a single point?
He stared at her blankly. Wait, now she was talking about caterpillars and lengths? Could this be two things? He looked down at the equation, already feeling his brain tangling into knots. "How....how the hell does that relate to anything? I thought these were points on a map, not the growth of something..." he said helplessly. "I didn't think time had anything to do with it..." The rest of it went so far over his head she might as well have been speaking another language. Vaguely he could see what she meant but she wasn't so sure about how the numbers related to the concepts. She was so intelligent and learned. He never knew any child to speak the way she did.
Vivian looked at Vin up and down. "There's no way you're a child, not explaining things the way you do. You're a...oh what the hell are they called...the short folk. Halflings? We had a dwarf in the brothel named Ottoman for obvious reasons." He smirked. That was it, wasn't it?
He got up and offered her a hand. "C'mon, let's use the chalkboard in the den. Whatever you may be, genius child or smallfolk, it doesn't matter much to me."