<?xml version="1.0" encoding="UTF-8"?><?xml-stylesheet type="text/xsl" href="static/style.xsl"?><OAI-PMH xmlns="http://www.openarchives.org/OAI/2.0/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/ http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd"><responseDate>2026-09-19T15:18:29Z</responseDate><request verb="GetRecord" identifier="oai:mountainscholar.org:10217/244023" metadataPrefix="dim">https://api.mountainscholar.org/server/oai/request</request><GetRecord><record><header><identifier>oai:mountainscholar.org:10217/244023</identifier><datestamp>2026-04-07T11:04:47Z</datestamp><setSpec>com_10217_100532</setSpec><setSpec>com_10217_100000</setSpec><setSpec>com_10217_100468</setSpec><setSpec>com_10217_100303</setSpec><setSpec>col_10217_100536</setSpec><setSpec>col_10217_100469</setSpec></header><metadata><dim:dim xmlns:dim="http://www.dspace.org/xmlns/dspace/dim" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:doc="http://www.lyncode.com/xoai" xsi:schemaLocation="http://www.dspace.org/xmlns/dspace/dim http://www.dspace.org/schema/dim.xsd">
   <dim:field mdschema="dc" element="contributor" qualifier="author">Livingston, Colleen, author</dim:field>
   <dim:field mdschema="dc" element="contributor" qualifier="author">Gaines, Robert E., advisor</dim:field>
   <dim:field mdschema="dc" element="date" qualifier="accessioned">2026-04-06T18:25:14Z</dim:field>
   <dim:field mdschema="dc" element="date" qualifier="issued">1999</dim:field>
   <dim:field mdschema="dc" element="identifier" qualifier="uri">https://hdl.handle.net/10217/244023</dim:field>
   <dim:field mdschema="dc" element="identifier" qualifier="uri">https://doi.org/10.25675/3.026689</dim:field>
   <dim:field mdschema="dc" element="description" qualifier="abstract">This paper considers existence theorems for the optimal control problem min (x,u) lo(x(0),x(T))+ ʃT0 fo(t,x(t),x(t),u(t)) subject to: x(t) = f(t ,x(t),u(t)) (x(0), x(T)) ∈ B (x(t),u(t)) ∈ F x ∈ An[0, T] u ∈ Lm[0, T] Using the results of R.T. Rockafellar this problem is reformulated into a problem in which the control and the constraints are absorbed into the objective function. Rockafellar has established a general existence theorem for such control problems. This existence theorem requires finding bounds on a Hamiltonian function. In his work Rockafellar specialized his results to certain initial value problems. The central new theorems in this paper specialize Rockafellar's general theorem to periodic problems in optimal control. These theorems are then coupled with results of R.E. Gaines and J. Peterson which give necessary conditions for a finite minimum.</dim:field>
   <dim:field mdschema="dc" element="format" qualifier="medium">doctoral dissertations</dim:field>
   <dim:field mdschema="dc" element="language">English</dim:field>
   <dim:field mdschema="dc" element="language" qualifier="iso">eng</dim:field>
   <dim:field mdschema="dc" element="publisher">Colorado State University. Libraries</dim:field>
   <dim:field mdschema="dc" element="relation" qualifier="ispartof">1980-1999</dim:field>
   <dim:field mdschema="dc" element="rights">Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.</dim:field>
   <dim:field mdschema="dc" element="rights" qualifier="license">Per the terms of a contractual agreement, all use of this item is limited to the non-commercial use of Colorado State University and its authorized users.</dim:field>
   <dim:field mdschema="dc" element="subject">mathematics</dim:field>
   <dim:field mdschema="dc" element="title">Periodic existence theorems in optimal control</dim:field>
   <dim:field mdschema="dc" element="type">Text</dim:field>
   <dim:field mdschema="thesis" element="degree" qualifier="name">Doctor of Philosophy (Ph.D.)</dim:field>
   <dim:field mdschema="thesis" element="degree" qualifier="level">Doctoral</dim:field>
   <dim:field mdschema="thesis" element="degree" qualifier="discipline">Mathematics</dim:field>
   <dim:field mdschema="thesis" element="degree" qualifier="grantor">Colorado State University</dim:field>
   <dim:field mdschema="dcterms" element="rights" qualifier="dpla">This Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).</dim:field>
   <dim:field mdschema="others" element="access-status">open.access</dim:field>
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