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· 2007

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A solution to Crouzeix's conjecture

math.CA · 2026-08-04 · accept · novelty 7.0

Crouzeix's conjecture is proved: for any bounded operator A and any rational f, ||f(A)|| ≤ 2 sup_{W(A)} |f|.

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  • A solution to Crouzeix's conjecture math.CA · 2026-08-04 · accept · none · ref 6

    Crouzeix's conjecture is proved: for any bounded operator A and any rational f, ||f(A)|| ≤ 2 sup_{W(A)} |f|.