Robert Hayes was sixty-seven years old. He lived in a small house in a small town in Connecticut. He had taught mathematics at a local college for thirty-five years. He had retired three years ago. He lived alone. His wife Martha had died five years ago. His children lived in California and never visited.

Every night, Robert sat at his kitchen table with a cup of tea and a pad of paper. He was working on a proof, a simple proof, he thought, that the universe must have an edge, not a physical edge but a mathematical one, a point where the equations stopped making sense.

He had been working on it for eleven years. He had made no progress.

The kitchen was small and quiet. The tea was always hot. The paper was always blank when he sat down and always covered with equations when he stood up. He wrote an equation. He erased it. He wrote another.

The grocery store was three blocks from his house. He bought tea and bread and sometimes eggs. The cashier asked how he was. He said "Fine." He was not fine. He did not know what fine meant.

Martha's funeral was in the autumn. Robert sat in the front row. He thought about the proof during the service. He could not stop thinking about it. The proof was the most important thing in his life. Martha had understood this, in the way that a person understands something they accept but do not fully comprehend. Martha was dead now, and the proof was the only thing he had left.

His daughter called from California in the spring. "Dad, when are we coming to visit?" He said "Soon." He would not say soon.

The breakthrough came on a Wednesday in October. Robert wrote a line of proof and it worked. He knew, for one moment, that the universe had an edge. The equations stopped making sense at a certain point, not because of human limitation but because the universe itself had a boundary, a mathematical horizon beyond which logic did not apply.

Then he lost it.

He sat at the table and tried to hold onto the knowledge, the way you try to hold onto water in your cupped hands. But the knowledge was slipping, like sand through a sieve. The equations on the paper were still there, but the understanding was gone. Robert looked at the symbols and they meant nothing to him now. They had meant everything a moment ago.

He was old now. The proof was unfinished. He left the paper on the table. He went to bed. The tea was cold.

The wind blew through the Connecticut trees. The leaves fell. Robert Hayes sat at his kitchen table and wrote an equation and erased it and wrote another.

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