### The distributivity numbers of ${\mathcal P}(\omega)$/fin and its square

by Shelah and Spinas. [ShSi:494]

Transactions American Math Soc, 2000

We show that in a model obtained by forcing with a
countable support iteration of length omega_2 of Mathias
forcing h (2), the distributivity number of r.o. (P (omega) /fin)^2,
is omega_1 but h, the one of
P (omega) /fin, is omega_2 .

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