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<top_article>
<mrnumber>MR2154375</mrnumber>
<author>Hidano, Kunio and Yokoyama, Kazuyoshi</author>
<author_utf8>Kunio HIDANO and Kazuyoshi YOKOYAMA</author_utf8>
<title>A Remark on the Almost Global Existence Theorems of Keel, Smith and Sogge</title>
<journal>Funkcialaj Ekvacioj. Serio Internacia</journal>
<volume>48</volume>
<year>2005</year>
<page>1--34</page>
<url_pdf>http://fe.math.kobe-u.ac.jp/FE/FullPapers/48-1/48_1.pdf</url_pdf>
<mathsci_link>http://www.ams.org/mathscinet-getitem?mr=MR2154375</mathsci_link>
<abstract>We give a new proof of temporally global existence of small solutions for systems of semi-linear wave equations. Our proof uses the Klainerman-Sideris inequality and a space-time $L^2$-estimate. We also discuss whether the scale-invariant version of the space-time $L^2$-estimates can hold, and obtain some related estimates. Among other things, we prove that the Keel-Smith-Sogge estimate actually holds in all space dimensions.</abstract>
<keywords>Semi-linear wave equation, Null condition, Global existence, Space-time $L^2$-estimate.</keywords>
<subject>35L15, 35L70.</subject>
<fesi_info>
  <FILE>48-1</FILE>
  <YEAR>2005</YEAR>
  <TITLE>A Remark on the Almost Global Existence Theorems of Keel, Smith and Sogge</TITLE>
  <AUTHOR>HIDANO, Kunio and YOKOYAMA, Kazuyoshi</AUTHOR>
  <AUTHOR_utf8>Kunio HIDANO and Kazuyoshi YOKOYAMA</AUTHOR_utf8>
</fesi_info>

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