Semiproper forcing axiom implies Martin maximum but not $rm PFA^+$

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@article{85731e74acea4f3db9fb7637658e2496,

title = "Semiproper forcing axiom implies Martin maximum but not \$rm PFA\textasciicircum{}+\$",

author = "Saharon Shelah",

year = "1987",

doi = "10.2307/2274385",

language = "אנגלית",

volume = "52",

pages = "360--367",

journal = "Journal of Symbolic Logic",

issn = "0022-4812",

publisher = "Cambridge University Press",

number = "2",

}