Geodesic
Around splitting and reaping
Commentationes Mathematicae Universitatis Carolinae, Tome 39 (1998) no. 2, pp. 269-279.

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We prove several results on some cardinal invariants of the continuum which are closely related to either the splitting number $\mathfrak s$ or its dual, the reaping number $\mathfrak r$.
Classification : 03E05, 03E17, 03E35
Keywords: cardinal invariants of the continuum; splitting number; open splitting number; reaping number; $\sigma$-reaping number; Cicho'n's diagram; Hechler forcing; finite support iteration 
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     title = {Around splitting and reaping},
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Brendle, Jörg. Around splitting and reaping. Commentationes Mathematicae Universitatis Carolinae, Tome 39 (1998) no. 2, pp. 269-279. http://geodesic.mathdoc.fr/item/CMUC_1998__39_2_a4/