I am reading about the consistency of Borel's conjecture in Jech's Set theory, and I can't figure out what $$ t^{\frown}a $$ means.
It can be found on p. 565 in Jech's Set Theory 3rd Millennium Edition on line 3.
2026-04-13 08:28:19.1776068899
Definition of $t^{\frown}a$ in Jech: Set theory
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