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Souslin trees which are hard to specialise |
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| Authors: | James Cummings |
| Affiliation: | Mathematics Institute, Hebrew University, Givat Ram, 91904 Jerusalem, Israel |
| Abstract: | We construct some  -Souslin trees which cannot be specialised by any forcing which preserves cardinals and cofinalities. For  a regular cardinal we use the  principle, and for  singular we use squares and diamonds. |
| Keywords: | Souslin trees ascent paths squares and diamonds |
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