Ideals induced by Tsirelson submeasures

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Ilijas Farah Fundamenta Mathematicae 159 (1999), 243-258 DOI: 10.4064/fm-159-3-243-258

We use Tsirelson's Banach space ([2]) to define an $F_σ$ P-ideal which refutes a conjecture of Mazur and Kechris (see [12, 9, 8]).