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McCulloh, Leon R., Benson, Steven Rex 2014-12-16T06:18:26Z 2014-12-16T06:18:26Z 10000-01-01 1988 1988 Let F be a finite extension of $\doubq\sb{p}$. Let L/F be a normal, totally ramified extension of degree $p\sp{2n}$ with ${\cal B}$ the maximal ideal of ${\cal D}\sb{\rm L}$. Suppose the Hilbert sequence for L/F has a unique breakpoint at $t$. That is, if ${\cal G}$ = Gal(L/F), then its Hilbert sequence is ${\cal G}$ = ${\cal G}\sb0$ = ${\cal G}\sb1$ = $\cdots$ = ${\cal G}\sb{t}\ne{\cal G}\sb{t+1}$ = $\{1\}$. For a subextension K/F of degree $p\sp{n}$ with G = Gal(K/F), we define $\Theta\sbsp{\rm K}{\rm L}$: G $\mapsto$ ${\cal B}\sp{tp\sp{\rm n}}/{\cal B}\sp{tp{\sp\rm n}+1}$ by $\sigma$ $\mapsto$ ${\sigma\pi-\pi}\over{\pi}$ + ${\cal B}\sp{tp\sp{\rm n}+1}$, where $\pi$ is a uniformizer for K/F. If K$\sp\prime$/F is another subextension of degree $p\sp{n}$ with G$\sp\prime$ = Gal(K$\sp\prime$/F), we similarly define $\Theta\sbsp{\rm K\sp\prime}{\rm L}$: G$\sp\prime$ $\to$ ${\cal B}\sp{tp\sp{\rm n}}/{\cal B}\sp{tp\sp{\rm n}+1}.$ Define $M\sb{\rm L}$(K,K$\sp\prime$) = max$\{m$: ${\cal D}\sb{\rm K}$ + ${\cal B}\sp{m}$ = ${\cal D}\sb{\rm K\sp\prime}$ + ${\cal B}\sp{m}\}$ and suppose K $\cap$ K$\sp\prime$ = F. If $t$ = 1, we show M$\sb{\rm L}$(K,K$\sp\prime$) = $p\sp{n}$ + $i$ where $i$ is the smallest integer satisfying $\varepsilon\sb{i}(\Theta\sbsp{\rm K}{\rm L}$(G)) $\ne$ $\varepsilon\sb{i}(\Theta\sbsp{\rm K\sp\prime}{\rm L}$(G$\sp\prime$)) in ${\cal B}\sp{itp\sp{\rm n}}/{\cal B}\sp{itp\sp{\rm n}+1}$ and $\varepsilon\sb{i}$ is the $i$th elementary symmetric function. In addition, we show that if $\pi$ and $\pi\sp\prime$ are uniformizers for K/F and K$\sp\prime$/F such that $v\sb{\rm L}$ ($\pi-\pi\sp\prime$) $>$ $v\sb{\rm L}(\pi)$ (= $p\sp{n}$), then $v\sb{\rm L}(\pi-\pi\sp\prime$) = $M\sb{\rm L}$(K,K$\sp\prime$). More generally, if $t$ $<$ $p$, then $M\sb{\rm L}$(K,K$\sp\prime$) $\geq$ ($t$ + 1) $p\sp{n}$-$tp\sp{n-1}$, with equality if and only if $\varepsilon\sb{p\sp{\rm n}-p\sp{\rm n-1}}$($\Theta\sbsp{\rm K}{\rm L}$(G)) $\ne$ $\varepsilon\sb{p\sp{\rm n}-p\sp{\rm n-1}}$($\Theta\sbsp{\rm K\sp\prime}{\rm L}$(G$\sp\prime$)). Made available in DSpace on 2014-12-16T06:18:26Z (GMT). No. of bitstreams: 1 8908621.pdf: 1257812 bytes, checksum: d0d3c16aefecc2e4bce00aad6851a0aa (MD5) Previous issue date: 1988 Embargo set by: Seth Robbins for item 71435 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 50 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1988. http://hdl.handle.net/2142/71269 (UMI)AAI8908621 Mathematics Canonical Invariants for Corresponding Residue Systems in P-Adic Fields text Mathematics Mathematics University of Illinois at Urbana-Champaign Dissertation Ph.D.