He stayed for three weeks. He slept in the plastic chair. He read her old stories—not stochastic processes, but fairy tales, the ones she’d loved as a child. He held her hand when the pain was bad. He told her about the lighthouse postcard, that he’d kept it all these years, that he’d lied about filing it away.
“The present state required it,” he said. Then winced. Even now, he couldn’t help himself. markov chain norris
The rain over Cambridge was the kind that didn’t fall so much as seep—into coats, into bones, into the very margins of notebooks left too long on park benches. Professor Alistair Norris, aged forty-seven, holder of the Chair in Stochastic Processes, stood at the window of his college rooms and watched the students scatter like particles undergoing Brownian motion. He stayed for three weeks
He spent the next hour grading papers on transition matrices. Then he made tea. Then he stood at the window again. The rain hadn’t stopped. The future state— go or stay —depended only on the present. And the present contained a daughter in a hospital bed, and a father who had spent a decade pretending that the past had no probability mass. He held her hand when the pain was bad