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On radial solutions for singular combined superlinear elliptic systems on annular domains
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We prove the existence of a large positive solution to the systemv class="formula" id="fm0010">v class="mathml"><span id="mmlsi1" class="mathmlsrc">source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0022247X16304796&_mathId=si1.gif&_user=111111111&_pii=S0022247X16304796&_rdoc=1&_issn=0022247X&md5=f1598059531db40950672e4b66fa78fc">ss="imgLazyJSB inlineImage" height="68" width="317" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0022247X16304796-si1.gif">script>style="vertical-align:bottom" width="317" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0022247X16304796-si1.gif">script><span class="mathContainer hidden"><span class="mathCode">si1.gif" overflow="scroll">stretchy="true">{&minus;sup>stretchy="false">(sup>rN&minus;1sup>sub>ϕ1sub>stretchy="false">(sup>usup>stretchy="false">)stretchy="false">)sup>=λsup>rN&minus;1sup>sub>f1sub>stretchy="false">(vstretchy="false">),space width="0.25em">space>space width="0.25em">space>a<r<b,&minus;sup>stretchy="false">(sup>rN&minus;1sup>sub>ϕ2sub>stretchy="false">(sup>vsup>stretchy="false">)stretchy="false">)sup>=λsup>rN&minus;1sup>sub>f2sub>stretchy="false">(ustretchy="false">),space width="0.25em">space>space width="0.25em">space>a<r<b,ustretchy="false">(astretchy="false">)=0=ustretchy="false">(bstretchy="false">),vstretchy="false">(astretchy="false">)=0=vstretchy="false">(bstretchy="false">),span>span>span>ss="temp" src="/sd/blank.gif">v>v> where <span id="mmlsi2" class="mathmlsrc"><span class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0022247X16304796&_mathId=si2.gif&_user=111111111&_pii=S0022247X16304796&_rdoc=1&_issn=0022247X&md5=744649dc525ace58926d7abaac0f25d2" title="Click to view the MathML source">a>0span><span class="mathContainer hidden"><span class="mathCode">si2.gif" overflow="scroll">a>0span>span>span>, λ   is a small positive parameter, <span id="mmlsi18" class="mathmlsrc"><span class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0022247X16304796&_mathId=si18.gif&_user=111111111&_pii=S0022247X16304796&_rdoc=1&_issn=0022247X&md5=a3b1e7173cda256b98d8feb44d61ab70" title="Click to view the MathML source">f<sub>isub>:(0,∞)→Rspan><span class="mathContainer hidden"><span class="mathCode">si18.gif" overflow="scroll">sub>fisub>:stretchy="false">(0,stretchy="false">)stretchy="false">→variant="double-struck">Rspan>span>span> are continuous and <span id="mmlsi20" class="mathmlsrc">source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0022247X16304796&_mathId=si20.gif&_user=111111111&_pii=S0022247X16304796&_rdoc=1&_issn=0022247X&md5=8d386a6b10f1dbc4f6922629adbf12c9">ss="imgLazyJSB inlineImage" height="25" width="225" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0022247X16304796-si20.gif">script>style="vertical-align:bottom" width="225" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0022247X16304796-si20.gif">script><span class="mathContainer hidden"><span class="mathCode">si20.gif" overflow="scroll">sub>variant="normal">limzstretchy="false">→sub>subsup>ϕ1&minus;1subsup>stretchy="false">(sub>f1sub>stretchy="false">(cstretchy="false">(subsup>ϕ2&minus;1subsup>stretchy="false">(sub>f2sub>stretchy="false">(zstretchy="false">)stretchy="false">)stretchy="false">)z=span>span>span> for all <span id="mmlsi5" class="mathmlsrc"><span class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0022247X16304796&_mathId=si5.gif&_user=111111111&_pii=S0022247X16304796&_rdoc=1&_issn=0022247X&md5=48e4834ed172b93a3a4d8f2c05b74a98" title="Click to view the MathML source">c>0span><span class="mathContainer hidden"><span class="mathCode">si5.gif" overflow="scroll">c>0span>span>span>.

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