Analysis determines knotted surface invariants, highlighting complexity in surface topology.
Blair–Campisi–Taylor–Tomova [BCTT22] defined the [Formula: see text]-invariant [Formula: see text] of a knotted surface [Formula: see text], using pants complexes of trisection surfaces of bridge trisections of [Formula: see text]. After that, Aranda–Pongtanapaisan–Zhang [APZ23] introduced the [Formula: see text]-invariant [Formula: see text] using dual curve complexes instead of pants complexes. In this paper, we determine both the [Formula: see text]-invariant and the [Formula: see text]-invariant of any finite distant sum of standard surfaces, and this is the first example of knotted surfaces whose bridge numbers and these invariants can be arbitrarily large.
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Minami Taniguchi (2026) studied this question.
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