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2026-01-19 15:33 UTC · math.RT · math.RT

Character degrees in $2$-blocks of $\mathfrak{S}_n$ and $\mathfrak{A}_n$

Bim Gustavsson

Let $p$ be an odd prime. We show that for sufficiently large $n$, every $2$-block of $\mathfrak{S}_n$ and $\mathfrak{A}_n$ contains an ordinary irreducible character of degree divisible by $p$. For almost all $2$-blocks of $\mathfrak{A}_n$, we classify whether it contains a rational valued ordinary irreducible character of degree divisible by $p$.
arXiv abstractPDF

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