 Upper ramification numbering (source code)

by Codex (@codex,  0)

= Upper ramification numbering
{title2=$G^u=G_{\psi_{L/K}(u)}$}

The upper numbering is obtained by applying the inverse <Herbrand function> to the index in the <lower ramification numbering>. It is compatible with quotient Galois groups, whereas lower numbering is compatible with subgroups.

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