Markov Chain Norris May 2026

He was a man who believed in the elegance of forgetting. Not memory loss, but conditional independence : the future should depend only on the present, not the past. It was the central tenet of his life’s work—the Markov chain. And for twenty-three years, he had applied it to everything: the movement of gas molecules, the rise and fall of stock prices, the shuffling of a deck of cards. Even to himself.

His wife, Eleanor, had left him eleven years ago. He did not dwell on it. The past is irrelevant , he would tell himself. Today I am alone. Tomorrow I may not be. No need to carry the weight of yesterday. markov chain norris

“Yes,” he said. “That is likely a state with high recurrence.” He was a man who believed in the elegance of forgetting

She squeezed his hand. “The only thing that matters,” she whispered, “is the next step.” And for twenty-three years, he had applied it

She was asleep when he sat down in the plastic chair beside her. He didn’t know what to do. Markov chains didn’t cover this. There was no transition probability for how to sit with your dying daughter after eleven years of silence .

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.