where class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0001870815004429&_mathId=si7.gif&_user=111111111&_pii=S0001870815004429&_rdoc=1&_issn=00018708&md5=d28bf6e4b9bf82458362f9d46fe048c0" title="Click to view the MathML source">Nirrclass="mathContainer hidden">class="mathCode"> counts repelling cycles with no periodic rays landing at points in the cycle, class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0001870815004429&_mathId=si8.gif&_user=111111111&_pii=S0001870815004429&_rdoc=1&_issn=00018708&md5=896f172a72aae870955da68c27feb21a" title="Click to view the MathML source">{Qi}class="mathContainer hidden">class="mathCode"> form a wandering collection class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0001870815004429&_mathId=si11.gif&_user=111111111&_pii=S0001870815004429&_rdoc=1&_issn=00018708&md5=51ff89b83d43340bf10a9707a9ea712f" title="Click to view the MathML source">BCclass="mathContainer hidden">class="mathCode"> of non-(pre)critical branch continua, class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0001870815004429&_mathId=si10.gif&_user=111111111&_pii=S0001870815004429&_rdoc=1&_issn=00018708&md5=26950c8e0159c18c7a216e6dc05af198" title="Click to view the MathML source">χ=1class="mathContainer hidden">class="mathCode"> if class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0001870815004429&_mathId=si11.gif&_user=111111111&_pii=S0001870815004429&_rdoc=1&_issn=00018708&md5=51ff89b83d43340bf10a9707a9ea712f" title="Click to view the MathML source">BCclass="mathContainer hidden">class="mathCode"> is non-empty, and class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0001870815004429&_mathId=si12.gif&_user=111111111&_pii=S0001870815004429&_rdoc=1&_issn=00018708&md5=67649eb600658432c2c6be0d2cf98b87" title="Click to view the MathML source">χ=0class="mathContainer hidden">class="mathCode"> otherwise.