Browsing by Author "Ventura Capell, Enric"
Now showing items 1-20 of 59
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A description of auto-fixed subgroups in a free group
Martino, Armando; Ventura Capell, Enric (2004-06)
Article
Open AccessLet F be a finitely generated free group. By using Bestvina-Handel theory, as well as some further improvements, the eigengroups of a given automorphism of F (and its fixed subgroup among them) are globally analyzed and ... -
A recursive presentation for Mihailova's subgroup
Bogopolski, Oleg; Ventura Capell, Enric (2010)
Article
Open AccessWe give an explicit recursive presentation for Mihailova's sub- group M(H) of Fn Fn corresponding to a nite, concise and Pei er aspherical presentation H = hx1; : : : ; xn jR1; : : : ;Rmi. This partially answers a ... -
A Whitehad algorithm for toral relatively hyperbolic groups
Kharlampovich, Olga; Ventura Capell, Enric (2012-12-04)
Article
Open AccessThe Whitehead problem is solved in the class of toral relatively hyperbolic groups G (i.e. torsion-free relatively hyperbolic groups with abelian parabolic subgroups): there is an algorithm which, given two nite ... -
Absolute type shaft encoding using LFSR sequences with prescribed length
Fuertes Armengol, José Mª; Balle, Borja; Ventura Capell, Enric (2006-02)
Article
Open AccessMaximal-length binary sequences have been known for a long time. They have many interesting properties, one of them is that when taken in blocks of n consecutive positions they form 2 n ° 1 diÆerent codes in a ... -
Absolute-type shaft encoding using LFSR sequences with a prescribed length
Fuertes Armengol, José Mª; Balle Pigem, Borja de; Ventura Capell, Enric (2008-03-31)
Article
Open AccessMaximal-length binary sequences have existed for a long time. They have many interesting properties, and one of them is that, when taken in blocks of n consecutive positions, they form 2n - 1 different codes in a closed ... -
Algorithmic problems for free-abelian times free groups
Delgado Rodríguez, Jordi; Ventura Capell, Enric (2013-10-01)
Article
Open AccessWe study direct products of free-abelian and free groups with special emphasis on algorithmic problems. After giving natural extensions of standard notions into that family, we find an explicit expression for an arbitrary ... -
Algorithmic recognition of infinite cyclic extensions
Cavallo, Bren; Delgado Rodríguez, Jordi; Kahrobaei, Delaram; Ventura Capell, Enric (2016-10-25)
Article
Open AccessWe prove that one cannot algorithmically decide whether a finitely presented Z-extension admits a finitely generated base group, and we use this fact to prove the undecidability of the BNS invariant. Furthermore, we show ... -
An algorithm to design prescribed length codes for single-tracked shaft encoders
Balle Pigem, Borja de; Ventura Capell, Enric; Fuertes Armengol, José Mª (2009-04-14)
Conference report
Open AccessAbstract-Maximal-length binary shift register sequences have been known for a long time. They have many interesting properties, one of them is that when taken in blocks of n consecutive positions they form 2n - 1 different ... -
ÀLGEBRA (Examen 1r quadrimestre)
Ventura Capell, Enric (Universitat Politècnica de Catalunya, 2006-01-13)
Exam
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ÀLGEBRA (Examen 1r quadrimestre)
Ventura Capell, Enric (Universitat Politècnica de Catalunya, 2005-11-25)
Exam
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Bounding the gap between a free group (outer) automorphism and its inverse
Ladra, Manuel; Silva, Pedro V.; Ventura Capell, Enric (2016-09-01)
Article
Open AccessFor any finitely generated group GG , two complexity functions aGaG and ßGßG are defined to measure the maximal possible gap between the norm of an automorphism (respectively, outer automorphism) of GG and the norm ... -
CÀLCUL (Examen 1r quadrim.)
Domènech Blázquez, Margarita; Puente del Campo, María Albina; Rubió Díaz, Pedro; Ventura Capell, Enric (Universitat Politècnica de Catalunya, 2006-01-15)
Exam
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CÀLCUL (Examen 1r quadrim.)
Domènech Blázquez, Margarita; Puente del Campo, María Albina; Rubió Díaz, Pedro; Ventura Capell, Enric (Universitat Politècnica de Catalunya, 2006-01-15)
Exam
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CÀLCUL (Examen 1r quadrim.)
Domènech Blázquez, Margarita; Puente del Campo, María Albina; Rubió Díaz, Pedro; Ventura Capell, Enric (Universitat Politècnica de Catalunya, 2006-01-15)
Exam
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CÀLCUL 1 (Examen 1r quadrim)
Ventura Capell, Enric (Universitat Politècnica de Catalunya, 2008-12-22)
Exam
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CÀLCUL 1 (Examen 1r quadrim)
Ventura Capell, Enric (Universitat Politècnica de Catalunya, 2008-11-14)
Exam
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CÀLCUL 1 (Examen 1r quadrim)
Ventura Capell, Enric; Pons Vallès, Montserrat (Universitat Politècnica de Catalunya, 1999-01-14)
Exam
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CÀLCUL 1 (Examen 1r quadrim)
Ventura Capell, Enric; Pons Vallès, Montserrat (Universitat Politècnica de Catalunya, 1996-11-14)
Exam
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CÀLCUL 1 (Examen 1r quadrim)
Ventura Capell, Enric; Pons Vallès, Montserrat (Universitat Politècnica de Catalunya, 2000-11-06)
Exam
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CÀLCUL 1 (Examen 1r quadrim)
Ventura Capell, Enric; Pons Vallès, Montserrat (Universitat Politècnica de Catalunya, 2004-01-12)
Exam
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