Proceedings of the American Mathematical Society

Author(s): James Hirschorn
Journal: Proc. Amer. Math. Soc. 128 (2000), 599-604.
MSC (1991): Primary 03E10; Secondary 03E40, 28A20
Posted: July 7, 1999
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Abstract: We give mathematical reformulations of the cardinals $\mathfrak p$ and $\mathfrak t$ in terms of families of Borel functions. As an application we show that $\mathfrak t$ is invariant under the addition of a single Cohen real.

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