difference between n - 1 and n-1

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I hope things are going well. I am doing some recursion stuff with databases and the text book I am reading has made it clear there is a difference between n-1 for example and n - 1. The difference being there is spacing. I know n-1 means n minus one. Does anyone know what the other is. Maybe n to one or n in increments of one.

Thanks in advance.

Ben.