Silvio DOLFI

Ruolo attuale:: Professore Ordinario
SSD:: MATH-02/A - Algebra
Afferenza organizzativa:: Dipartimento di Matematica e Informatica 'Ulisse Dini'

Recapiti

	0552758922
	silvio.dolfi(AT)unifi.it

Ulteriori Recapiti

	Dipartimento di Matematica e Informatica Dini - Santa Marta - Stanza 118 (primo piano, ala est)
	http://web.math.unifi.it/users/dolfi/

Silvio DOLFI

Orario di ricevimento (aggiornato al 26/09/2024)

Ricevimento studenti:

martedi' 14-16

mercoledi' 13.30-14.30

oppure scrivere un messaggio a: silvio.dolfi at unifi.it

Silvio DOLFI

Biografia

30.10.1987. Laurea in Matematica col massimo dei voti e la lode, presso l'Universita`
degli Studi di Firenze. Titolo della tesi di laurea: "Sui gruppi di Frobenius ipernormalizzanti". 
Relatore: Prof. G. Zappa. 
Nel periodo di tesi fruisce di una borsa di studio INDAM per laureandi.

8.7.1993. Dottorato di Ricerca in Matematica, presso l'Universita` degli Studi di
Firenze. Titolo della tesi di dottorato: "Condizioni aritmetiche sulle lunghezze delle classi di 
coniugio di un gruppo finito". 
Supervisore: Prof. B. Huppert (Universita' di Mainz - RFT).

Silvio DOLFI

Curriculum


1987: Laurea in Matematica; relatore prof. G. Zappa

1988-1992: Dottorato in Matematica; relatore prof. B. Huppert (Mainz)

1992-1994: Borsa di studio post-dottorato dell'Istituto Nazionale di Alta Matematica "F. Severi"

1994-1995: Borsa di studio post-dottorato dell'Universita' degli studi di Udine

1995-2014: Ricercatore presso l'Universita' degli Studi di Firenze

2014-  : Professore associato presso l'Universita' degli Studi di Firenze

Ha tenuto varie comunicazioni in convegni nazionali e internazionali.

Ha trascorso periodi di studio e ricerca in diverse universita', tra le 
quali: Universita' di Mainz (RFT), Universita' di Madison (USA), Universita' 
di Valencia (SPAGNA), University of Western Australia, Tel Aviv University e
Technion (Haifa, Israele), HRI (Allahabad, India). 

Ha collaborato e collabora con studiosi italiani e stranieri, tra cui C. Casolo 
(Universita` di Firenze), E. Jabara (Universita' di Venezia), D. Chillag (Techinon, Haifa), 
M. Herzog (Tel Aviv University), G. Navarro e  L. Sanus Vitoria (Universita` di Valencia), 
C. Praeger (University of Western Australia), M. Yadav (HRI).

Curriculum: http://web.math.unifi.it/users/dolfi/Curriculum.short.pdf

Silvio DOLFI

Interessi

Algebra, in particolare Teoria dei Gruppi: gruppi di permutazioni, teoria delle
rappresentazioni e teoria dei caratteri dei gruppi finiti.

Silvio DOLFI

Note

Curriculum

Silvio DOLFI

Pubblicazioni

Legenda

Contributo su rivista |

Articolo su libro |

Libro |

Contributo in atti di convegno (proceeding) |

Brevetto |

Curatela | Altro

Altro |

Tesi di Dottorato

Dolfi S. (2023). On the proportion of vanishing elements in finite groups. JOURNAL OF ALGEBRA, vol. 614, pp. 825-847, ISSN:0021-8693 DOI

Dolfi, S; Pacifici, E; Sanus, L; Sotomayor, V (2023). Non-solvable Groups whose Character Degree Graph has a Cut-Vertex. I. VIETNAM JOURNAL OF MATHEMATICS, vol. 51, pp. 731-753, ISSN:2305-221X DOI

Dolfi, S; Pacifici, E; Sanus, L (2023). Non-solvable groups whose character degree graph has a cut-vertex. II. ANNALI DI MATEMATICA PURA ED APPLICATA, vol. 202, pp. 1753-1780, ISSN:0373-3114 DOI Accesso ONLINE all'editore

Dolfi S.; Pacifici E.; Sanus L. (2023). Non-solvable groups whose character degree graph has a cut-vertex. III. ANNALI DI MATEMATICA PURA ED APPLICATA, vol. 202, pp. 2517-2540, ISSN:1618-1891 DOI

Akhlaghi Z.; Dolfi S.; Pacifici E. (2021). On Huppert's rho-sigma conjecture. JOURNAL OF ALGEBRA, vol. 586, pp. 537-560, ISSN:0021-8693 DOI Accesso ONLINE all'editore

Dolfi, s (2021). p-power conjugacy classes in U(n,q) and T(n,q). JOURNAL OF ALGEBRA AND ITS APPLICATIONS, pp. 1-13, ISSN:0219-4988 DOI

Dolfi, S., Pacifici, E. (2021). On groups having a p-constant character. PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, vol. 149, pp. 107-120, ISSN:0002-9939 DOI Accesso ONLINE all'editore

Dolfi S.; Pacifici E.; Sanus L.; Sotomayor V. (2021). Groups whose prime graph on class sizes has a cut vertex. ISRAEL JOURNAL OF MATHEMATICS, vol. 244, pp. 775-805, ISSN:0021-2172 DOI Accesso ONLINE all'editore

Akhlaghi Z.; Dolfi S.; Pacifici E.; Sanus L. (2020). Bounding the number of vertices in the degree graph of a finite group. JOURNAL OF PURE AND APPLIED ALGEBRA, vol. 224, pp. 725-731, ISSN:0022-4049 DOI Accesso ONLINE all'editore

Dolfi S.; Pacifici E.; Sanus L.; Sotomayor V. (2020). The prime graph on class sizes of a finite group has a bipartite complement. JOURNAL OF ALGEBRA, vol. 542, pp. 35-42, ISSN:0021-8693 DOI Accesso ONLINE all'editore

Akhlaghi Z.; Casolo C.; Dolfi S.; Pacifici E.; Sanus L. (2019). On the character degree graph of finite groups. ANNALI DI MATEMATICA PURA ED APPLICATA, vol. 198, pp. 1595-1614, ISSN:0373-3114 DOI Accesso ONLINE all'editore

Silvio Dolfi, Khatoon Khedri, Emanuele Pacifici (2018). Groups whose degree graph has three independent vertices. JOURNAL OF ALGEBRA, vol. 512, pp. 66-80, ISSN:1090-266X DOI Accesso ONLINE all'editore

S. Dolfi (2018). On zeros of characters of finite groups. In: N.S. Sastry, M.K. Yadav. Group theory and computation, pp. 41-58 Springer, ISBN:978-981-13-2046-0. DOI

Akhlaghi, Z., Casolo, C., Dolfi, S., Pacifici, E., Sanus, L. (2018). On the character degree graph of solvable groups. PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, vol. 146, pp. 1505-1513, ISSN:0002-9939 DOI Accesso ONLINE all'editore

Dolfi, Silvio; Pacifici, Emanuele; Sanus, Lucia (2017). NONVANISHING ELEMENTS FOR BRAUER CHARACTERS. JOURNAL OF THE AUSTRALIAN MATHEMATICAL SOCIETY, vol. 102, pp. 96-107, ISSN:1446-7887 DOI Accesso ONLINE all'editore

Dolfi, Silvio, Manoj Yadav (2016). Finite groups whose non-linear irreducible characters of the same degree are Galois conjugate. JOURNAL OF ALGEBRA, vol. 452, pp. 1-16, ISSN:0021-8693 DOI Accesso ONLINE all'editore

Casolo, Carlo; Dolfi, Silvio; Pacifici, Emanuele; Sanus, Lucia (2016). Groups whose character degree graph has diameter three. ISRAEL JOURNAL OF MATHEMATICS, vol. 215, pp. 523-558, ISSN:0021-2172 DOI Accesso ONLINE all'editore

Dolfi, Silvio; Guralnick, Robert; Praeger, Cheryl E.; Spiga, Pablo (2016). On the maximal number of coprime subdegrees in finite primitive permutation groups. ISRAEL JOURNAL OF MATHEMATICS, vol. 216, pp. 107-147, ISSN:0021-2172 DOI Accesso ONLINE all'editore

Dolfi, Silvio; Gluck, David; Navarro, Gabriel (2015). On the orders of real elements of solvable groups. ISRAEL JOURNAL OF MATHEMATICS, vol. 210, pp. 1-21, ISSN:0021-2172 DOI Accesso ONLINE all'editore

Silvio Dolfi;Emanuele Pacifici (2014). Zeros of Brauer characters and linear actions of finite groups: Small primes. JOURNAL OF ALGEBRA, vol. 399, pp. 343-357, ISSN:0021-8693 DOI

S. Dolfi; G. Navarro; P.H. Tiep (2013). FINITE GROUPS WHOSE SAME DEGREE CHARACTERS ARE GALOIS CONJUGATE. ISRAEL JOURNAL OF MATHEMATICS, vol. 198, pp. 283-331, ISSN:0021-2172 DOI

C. Casolo; S. Dolfi; E. Pacifici; L. Sanus (2013). Incomplete vertices in the prime graph on conjugacy class sizes of finite groups. JOURNAL OF ALGEBRA, vol. 376, pp. 46-57, ISSN:0021-8693 DOI

S. Dolfi; R. Guralnick; C. Praeger; P. Spiga (2013). COPRIME SUBDEGREES FOR PRIMITIVE PERMUTATION GROUPS AND COMPLETELY REDUCIBLE LINEAR GROUPS. ISRAEL JOURNAL OF MATHEMATICS, vol. 195, pp. 745-772, ISSN:0021-2172 DOI

C. Casolo; S. Dolfi; E. Jabara (2012). FINITE GROUPS WHOSE NONCENTRAL CLASS SIZES HAVE THE SAME p-PART FOR SOME PRIME p. ISRAEL JOURNAL OF MATHEMATICS, vol. 192, pp. 197-219, ISSN:1565-8511 DOI

C. Casolo; S. Dolfi; E. Pacifici; L. Sanus (2012). Groups whose prime graph on conjugacy class sizes has few complete vertices. JOURNAL OF ALGEBRA, vol. 364, pp. 1-12, ISSN:0021-8693 DOI

S. Dolfi; G. Malle; G. Navarro (2012). THE FINITE GROUPS WITH NO REAL p-ELEMENTS. ISRAEL JOURNAL OF MATHEMATICS, vol. ..., pp. 1-10, ISSN:0021-2172 DOI

S. Dolfi; G. Navarro (2012). FINITE GROUPS WITH ONLY ONE NONLINEAR IRREDUCIBLE REPRESENTATION. COMMUNICATIONS IN ALGEBRA, vol. 40, pp. 4324-4329, ISSN:0092-7872 DOI

S. Dolfi; R. Guralnick; M. Herzog; C. Praeger (2012). A new solvability criterion for finite groups. JOURNAL OF THE LONDON MATHEMATICAL SOCIETY, vol. 85, pp. 269-281, ISSN:0024-6107 DOI

S. Dolfi; E. Pacifici (2011). Zeros of Brauer characters and linear actions of finite groups. JOURNAL OF ALGEBRA, vol. 340, pp. 104-113, ISSN:0021-8693 DOI

S. Dolfi; L. Sanus; E. Pacifici (2010). Finite groups with real conjugacy classes of prime size. ISRAEL JOURNAL OF MATHEMATICS, vol. 175, pp. 179-189, ISSN:0021-2172 DOI

S. Dolfi; E. Pacifici; P. Spiga; L. Sanus (2010). On the vanishing prime graph of finite groups. JOURNAL OF THE LONDON MATHEMATICAL SOCIETY, vol. 82, pp. 167-183, ISSN:0024-6107 DOI

S. Dolfi; G. Navarro; E. Pacifici; L. Sanus; P. Tiep (2010). Non-vanishing elements of finite groups. JOURNAL OF ALGEBRA, vol. 323, pp. 540-545, ISSN:0021-8693 DOI

S. Dolfi; E. Pacifici; L. Sanus (2010). Groups whose vanishing class sizes are not divisible by a given prime. ARCHIV DER MATHEMATIK, vol. 94, pp. 311-317, ISSN:0003-889X DOI

S. Dolfi; E. Pacifici; L. Sanus; P. Spiga (2010). On the vanishing prime graph of solvable groups. JOURNAL OF GROUP THEORY, vol. 13, pp. 189-206, ISSN:1433-5883 DOI

S. Dolfi; M. Herzog; E. Jabara (2010). Finite groups whose noncentral commuting elements have centralizers of equal size. BULLETIN OF THE AUSTRALIAN MATHEMATICAL SOCIETY, vol. 82, pp. 293-304, ISSN:0004-9727 DOI

D. Chillag; S. Dolfi (2010). Semi-rational solvable groups. JOURNAL OF GROUP THEORY, vol. 13, pp. 535-548, ISSN:1433-5883 DOI

S. Dolfi; E. Jabara (2009). The structure of finite groups of conjugate rank 2. BULLETIN OF THE LONDON MATHEMATICAL SOCIETY, vol. 41, pp. 916-926, ISSN:0024-6093 DOI

D. BUBBOLONI; S. DOLFI; P. SPIGA (2009). Finite groups whose irreducible characters vanish only on p-elements. JOURNAL OF PURE AND APPLIED ALGEBRA, vol. 213, pp. 370-376, ISSN:0022-4049 DOI

D. Bubboloni; S. Dolfi; M. Iranmanesh; C. Praeger (2009). On bipartite divisor graphs for group conjugacy class sizes. JOURNAL OF PURE AND APPLIED ALGEBRA, vol. 213, pp. 1722-1734, ISSN:0022-4049 DOI

S. Dolfi; A. Moreto ; G. Navarro (2009). The groups with exactly one class of size a multiple of p. JOURNAL OF GROUP THEORY, vol. 12, pp. 219-234, ISSN:1433-5883

S. Dolfi; E. Pacifici; L. Sanus; P. Spiga (2009). On the orders of zeros of irreducible characters. JOURNAL OF ALGEBRA, vol. 321, pp. 345-352, ISSN:0021-8693 DOI

C. Casolo; S. Dolfi (2009). Products of primes in conjugacy class sizes and irreducible character degrees. ISRAEL JOURNAL OF MATHEMATICS, vol. 174, pp. 403-418, ISSN:0021-2172 DOI

S. Dolfi; G. Navarro (2009). Large orbits of elements centralized by a Sylow subgroup. ARCHIV DER MATHEMATIK, vol. 93, pp. 299-304, ISSN:0003-889X DOI

S. DOLFI (2008). Large orbits in coprime actions of solvable groups.. TRANSACTIONS OF THE AMERICAN MATHEMATICAL SOCIETY, vol. 360, n.1, pp. 135-152, ISSN:0002-9947

S. Dolfi; G. Navarro; P. H. Tiep (2008). Primes dividing the degrees of the real characters. MATHEMATISCHE ZEITSCHRIFT, vol. 259, pp. 755-774, ISSN:0025-5874

S. Dolfi; E. Pacifici; L. Sanus (2008). Finite groups with real-valued irreducible characters of prime degree. JOURNAL OF ALGEBRA, vol. 320, pp. 2181-2195, ISSN:0021-8693

S. Dolfi; M. Herzog; G. Kaplan; A. Lev (2007). The size of the solvable residual in finite groups. GROUPS, GEOMETRY, AND DYNAMICS, vol. 1, pp. 401-407, ISSN:1661-7207

C. Casolo; S. Dolfi (2007). Prime divisors of irreducible character degrees and of conjugacy class sizes in finite groups. JOURNAL OF GROUP THEORY, vol. 10, pp. 571-583, ISSN:1433-5883 DOI

S. Dolfi; M. Herzog; G. Kaplan; A. Lev (2007). On the size of the nilpotent residual in finite groups. JOURNAL OF GROUP THEORY, vol. 10, pp. 299-305, ISSN:1433-5883

S. DOLFI; E. JABARA (2007). Large character degrees of solvable groups with abelian Sylow 2-subgroups.. JOURNAL OF ALGEBRA, vol. 313, pp. 687-694, ISSN:0021-8693, Academic Press Incorporated:6277 Sea Harbor Drive:Orlando, FL 32887:(800)543-9534, (407)345-4100, EMAIL: ap@acad.com, INTERNET: http://www.idealibrary.com, Fax: (407)352-3445:

S. DOLFI (2006). On independent sets in the class graph of a finite group. JOURNAL OF ALGEBRA, vol. 303, pp. 216-224, ISSN:0021-8693, Academic Press Incorporated:6277 Sea Harbor Drive:Orlando, FL 32887:(800)543-9534, (407)345-4100, EMAIL: ap@acad.com, INTERNET: http://www.idealibrary.com, Fax: (407)352-3445:

S. Dolfi (2005). Intersections of odd order Hall subgroups. BULLETIN OF THE LONDON MATHEMATICAL SOCIETY, vol. 37, pp. 61-66, ISSN:0024-6093

S. Dolfi; E. Jabara; M.S. Lucido (2004). C55-groups. SIBERIAN MATHEMATICAL JOURNAL, vol. 45, pp. 1285-1298, ISSN:0037-4466

A. Colesanti; S. Dolfi; E. Rubei (2003). Dispense di Laboratorio di Matematica. pp. 1-148 Accesso ONLINE all'editore

S. DOLFI (2002). A NOTE ON CHARACTER RESTRICTIONS. COMMUNICATIONS IN ALGEBRA, vol. 30, pp. 3429-3434, ISSN:0092-7872

S. DOLFI; M. LUCIDO (2001). FINITE GROUPS IN WHICH P'-CLASSES HAVE Q'-LENGTH. ISRAEL JOURNAL OF MATHEMATICS, vol. 122, pp. 93-115, ISSN:0021-2172

S. DOLFI (2000). ORBITS OF A PERMUTATION GROUP ON THE POWER SET. ARCHIV DER MATHEMATIK, vol. 75, pp. 321-327, ISSN:0003-889X DOI

S. DOLFI; C. CASOLO (1996). The diameter of a conjugacy class graph of finite groups. BULLETIN OF THE LONDON MATHEMATICAL SOCIETY, vol. 28, pp. 141-148, ISSN:0024-6093 DOI

C. Casolo; S. Dolfi (1996). Conjugacy class lengths of metanilpotent groups. RENDICONTI DEL SEMINARIO MATEMATICO DELL'UNIVERSITA' DI PADOVA, vol. 96, pp. 121-130, ISSN:0041-8994

S. DOLFI (1995). ARITHMETICAL CONDITIONS ON THE LENGTH OF THE CONJUGACY CLASSES OF A FINITE GROUP. JOURNAL OF ALGEBRA, vol. 174, pp. 753-771, ISSN:0021-8693

S. DOLFI (1995). PRIME FACTORS OF CONJUGACY CLASS LENGTHS AND IRREDUCIBLE CHARACTER DEGREES IN FINITE SOLUBLE GROUPS. JOURNAL OF ALGEBRA, vol. 174, pp. 749-752, ISSN:0021-8693

S. Dolfi (1991). On hypernormalizing Frobenius groups. BOLLETTINO DELL'UNIONE MATEMATICA ITALIANA. B, vol. 5, pp. 521-543, ISSN:0392-4041

Silvio DOLFI

Curriculum

1992-1994: Post-doc scholarship of Istituto Nazionale di Alta Matematica "F. Severi"

1994-1995: Post-doc sholarship of Universita' degli studi di Udine

1995-2014:  Assistant Professor at Universita` degli Studi di
Firenze (Facolta` di Scienze Matematiche Fisiche e Naturali).

2014: Associate Professor at Universita` degli Studi di
Firenze (Facolta` di Scienze Matematiche Fisiche e Naturali).

Curriculum: http://web.math.unifi.it/users/dolfi/Curriculum.short.pdf


He has given several talks and communications in various Conferences.

He has visited for research purpose several Universities, including 
University of Mainz (Germany), University of Madison (USA), University of Valencia (Spain),
University of Western Australia, University of Tel Aviv and Technion in Haifa (Israel).

November 2014: Position as Associate Professor at the Mathematics Department of Universita' 
degli Studi di Firenze.

Silvio DOLFI

Interest

Finite group theory. Representation theory. Character theory.