{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,12]],"date-time":"2026-02-12T15:15:16Z","timestamp":1770909316911,"version":"3.50.1"},"reference-count":59,"publisher":"American Mathematical Society (AMS)","issue":"2","license":[{"start":{"date-parts":[[2004,8,21]],"date-time":"2004-08-21T00:00:00Z","timestamp":1093046400000},"content-version":"am","delay-in-days":366,"URL":"https:\/\/www.ams.org\/publications\/copyright-and-permissions"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Trans. Amer. Math. Soc."],"abstract":"<p>We initiate the study of the class of profinite graphs<inline-formula content-type=\"math\/mathml\"><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" alttext=\"normal upper Gamma\"><mml:semantics><mml:mi mathvariant=\"normal\">\u0393<\/mml:mi><mml:annotation encoding=\"application\/x-tex\">\\Gamma<\/mml:annotation><\/mml:semantics><\/mml:math><\/inline-formula>defined by the following geometric property: for any two vertices<inline-formula content-type=\"math\/mathml\"><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" alttext=\"v\"><mml:semantics><mml:mi>v<\/mml:mi><mml:annotation encoding=\"application\/x-tex\">v<\/mml:annotation><\/mml:semantics><\/mml:math><\/inline-formula>and<inline-formula content-type=\"math\/mathml\"><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" alttext=\"w\"><mml:semantics><mml:mi>w<\/mml:mi><mml:annotation encoding=\"application\/x-tex\">w<\/mml:annotation><\/mml:semantics><\/mml:math><\/inline-formula>of<inline-formula content-type=\"math\/mathml\"><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" alttext=\"normal upper Gamma\"><mml:semantics><mml:mi mathvariant=\"normal\">\u0393<\/mml:mi><mml:annotation encoding=\"application\/x-tex\">\\Gamma<\/mml:annotation><\/mml:semantics><\/mml:math><\/inline-formula>, there is a (unique) smallest connected profinite subgraph of<inline-formula content-type=\"math\/mathml\"><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" alttext=\"normal upper Gamma\"><mml:semantics><mml:mi mathvariant=\"normal\">\u0393<\/mml:mi><mml:annotation encoding=\"application\/x-tex\">\\Gamma<\/mml:annotation><\/mml:semantics><\/mml:math><\/inline-formula>containing them; such graphs are called<italic>tree-like<\/italic>. Profinite trees in the sense of Gildenhuys and Ribes are tree-like, but the converse is not true. A profinite group is then said to be<italic>dendral<\/italic>if it has a tree-like Cayley graph with respect to some generating set; a Bass-Serre type characterization of dendral groups is provided. Also, such groups (including free profinite groups) are shown to enjoy a certain small cancellation condition. We define a pseudovariety of groups<inline-formula content-type=\"math\/mathml\"><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" alttext=\"bold upper H\"><mml:semantics><mml:mrow class=\"MJX-TeXAtom-ORD\"><mml:mi mathvariant=\"bold\">H<\/mml:mi><\/mml:mrow><mml:annotation encoding=\"application\/x-tex\">\\mathbf {H}<\/mml:annotation><\/mml:semantics><\/mml:math><\/inline-formula>to be<italic>arboreous<\/italic>if all finitely generated free pro-<inline-formula content-type=\"math\/mathml\"><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" alttext=\"bold upper H\"><mml:semantics><mml:mrow class=\"MJX-TeXAtom-ORD\"><mml:mi mathvariant=\"bold\">H<\/mml:mi><\/mml:mrow><mml:annotation encoding=\"application\/x-tex\">\\mathbf {H}<\/mml:annotation><\/mml:semantics><\/mml:math><\/inline-formula>groups are dendral (with respect to a free generating set). Our motivation for studying such pseudovarieties of groups is to answer several open questions in the theory of profinite topologies and the theory of finite monoids. We prove, for arboreous pseudovarieties<inline-formula content-type=\"math\/mathml\"><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" alttext=\"bold upper H\"><mml:semantics><mml:mrow class=\"MJX-TeXAtom-ORD\"><mml:mi mathvariant=\"bold\">H<\/mml:mi><\/mml:mrow><mml:annotation encoding=\"application\/x-tex\">\\mathbf {H}<\/mml:annotation><\/mml:semantics><\/mml:math><\/inline-formula>, a pro-<inline-formula content-type=\"math\/mathml\"><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" alttext=\"bold upper H\"><mml:semantics><mml:mrow class=\"MJX-TeXAtom-ORD\"><mml:mi mathvariant=\"bold\">H<\/mml:mi><\/mml:mrow><mml:annotation encoding=\"application\/x-tex\">\\mathbf {H}<\/mml:annotation><\/mml:semantics><\/mml:math><\/inline-formula>analog of the Ribes and Zalesski\u012d product theorem for the profinite topology on a free group. Also, arboreous pseudovarieties are characterized as precisely the solutions<inline-formula content-type=\"math\/mathml\"><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" alttext=\"bold upper H\"><mml:semantics><mml:mrow class=\"MJX-TeXAtom-ORD\"><mml:mi mathvariant=\"bold\">H<\/mml:mi><\/mml:mrow><mml:annotation encoding=\"application\/x-tex\">\\mathbf {H}<\/mml:annotation><\/mml:semantics><\/mml:math><\/inline-formula>to the much studied pseudovariety equation<inline-formula content-type=\"math\/tex\"><tex-math>\\mathbf {J}\\ast \\mathbf {H}= \\mathbf {J} \\text {\\textcircled {<\/tex-math><\/inline-formula>m<inline-formula content-type=\"math\/tex\"><tex-math>}} \\mathbf {H}<\/tex-math><\/inline-formula>.<\/p>","DOI":"10.1090\/s0002-9947-03-03358-0","type":"journal-article","created":{"date-parts":[[2003,10,16]],"date-time":"2003-10-16T12:27:02Z","timestamp":1066307222000},"page":"805-851","source":"Crossref","is-referenced-by-count":16,"special_numbering":"825","title":["The geometry of profinite graphs with applications to free groups and finite monoids"],"prefix":"10.1090","volume":"356","author":[{"given":"K.","family":"Auinger","sequence":"first","affiliation":[]},{"given":"B.","family":"Steinberg","sequence":"additional","affiliation":[]}],"member":"14","published-online":{"date-parts":[[2003,8,21]]},"reference":[{"key":"1","series-title":"Series in Algebra","isbn-type":"print","volume-title":"Finite semigroups and universal algebra","volume":"3","author":"Almeida, Jorge","year":"1994","ISBN":"https:\/\/id.crossref.org\/isbn\/9810218958"},{"issue":"3-4","key":"2","doi-asserted-by":"publisher","first-page":"241","DOI":"10.1142\/S0218196799000163","article-title":"Hyperdecidable pseudovarieties and the calculation of semidirect products","volume":"9","author":"Almeida, Jorge","year":"1999","journal-title":"Internat. 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