Adding a lot of Cohen reals by adding a few I

In this paper we produce models $V_1\subseteq V_2$ of set theory such that adding $κ$-many Cohen reals to $V_2$ adds $λ$-many Cohen reals to $V_1$, for some $λ>κ$. We deal mainly with the case when $V_1$ and $V_2$ have the same cardinals.

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