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In this note, we give a motivic characterization of the integral cohomology of dual boundary complexes of smooth quasi-projective complex algebraic varieties. As a corollary, the dual boundary complex of any stably affine space (of positive dimension) is contractible. In a separate paper Su23, this corollary has been used by the author in his proof of the weak geometric P=W conjecture for very generic GLₙ (C) -character varieties over any punctured Riemann surfaces.
Tao Su (Fri,) studied this question.
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