Ana Portilla, Ph.D.
Department of Mathematics and Computer Science
Mathematics
Education
Ph.D. Mathematics, Universidad Carlos III, Madrid (Spain)
M.S. Mathematics, Universidad Complutense de Madrid (Spain)
Practice Areas
- Complex Analysis
- Geometric Function Theory
- Graph Theory
Publications and Media Placements
The names of the authors are listed in alphabetical order.
A. Granados, D. Pestana, A. Portilla, J. M. Rodríguez, E. Tourís, Liouville property and quasi-isometries on negatively curved Riemannian surfaces, Proceedings of the Royal Society of Edinburgh Section A: Mathematics 1—23 (2023).
J.M. Rodríguez, A. Granados, A. Portilla ¿Por qué lo llaman estadística cuando quieren decir sesgo? The Conversation; BBC; El Economista (2023).
Y. Quintana, A. Granados, A. Portilla ¿Y si en las elecciones generales contáramos los votos como los suecos? The Conversation (2023).
Carballosa, A. Granados, J.A. Méndez-Bermúdez, D. Pestana, A. Portilla, Computational properties of the arithmetic-geometric index, Journal of Mathematical Chemistry, 60 (2022): 1854–1871.
J. Gonzalo, A. Portilla, J.M. Rodríguez and E. Tourís, A decomposition for plane domains with the quasihyperbolic metric, Journal of Mathematical Analysis and Applications 502 (2021) 125227.
A. Granados, A. Portilla, J.M. Rodríguez and J.M. Sigarreta, Inequalities on the Geometric-Arithmetic Index, Hacettepe Journal of Mathematics and Statistics 50(3) 778-794 (2021)
A. Portilla, J. M. Rodríguez, J. M. Sigarreta, E. Touris Gromov hyperbolicity in directed graphs. Symmetry 12(1), 105 (2020). Special issue "Protection of graphs".
A. Granados, D. Pestana, A. Portilla, J. M. Rodríguez, E. Touris Stability of the volume growth rate under quasi-isometries. Revista Matemática Complutense (2019) 1-40.
W. Carballosa, A. Granados, D. Pestana, A. Portilla, J. M. Rodríguez, J. M. Sigarreta Relations between some topological índices and the line graph. Journal of Mathematical Chemistry 58(3) (2019) 1-15.
A. Portilla, J. M. Rodríguez, J. M. Sigarreta Recent lower bounds for Geometric-Arithmetic Index. Discrete Mathematics Letters (1) (2019) 59-82.
A. Granados, A. Portilla La función exponencial planta cara a la homeopatía, Revista SUMA 93 (2019).
A. Granados, A. Portilla La vacuna solidaria: las matemáticas demuestran que 93=100%, El Escéptico: la revista para el fomento de la razón y la ciencia 51, Invierno 2019.
A. Granados, D. Pestana, A. Portilla, J.M. Rodríguez, E. Touris Stability on the Injectivity Radius under Quasi-isometries and Applications to Isoperimetric Inequalities. Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales. Serie A. Matemáticas 112(4) (2018), 1225-1247.
A. Portilla, A. Granados La homeopatía suspende matemáticas. The Conversation; Público; Cadena Ser (2018).
A. Granados, D. Pestana, A. Portilla, J.M. Rodríguez Gromov Hyperbolicity in Mycielskian Graphs. Symmetry (2017), 9(8), 131.
A. Portilla, J. M. Rodríguez, J. M. Sigarreta, J.-M. Vilaire Gromov hyperbolic tessellation graphs. Utilitas Mathematica Vol. 97 (2015) 193-212.
A. Cantón, A. Granados, A. Portilla, J.M. Rodríguez. Quasi-isometries and isoperimetric inequalities in planar domains. Journal of the Mathematical Society of Japan. 67, No. 1 (2015) 127–157.
Walter Carballosa, Ana Portilla, J.M. Rodríguez, J.M. Sigarreta. Planarity and Hyperbolicity in Graphs. Graphs and Combinatorics. DOI: 10.1007/s00373-014-1459-4.
Alicia Cantón, Ana Granados, Ana Portilla, José M. Rodríguez. Isoperimetric inequalities in graphs and surfaces. Electronic Notes on Discrete Mathematics. Sept 2014 (Vol : 46) pp. 257-264. DOI: 10.1016/j.endm.2014.08.034.
J. Gonzalo, A. Portilla, J.M. Rodríguez, E. Tourís. The Topology of balls in Riemannian surfaces and Gromov hyperbolicity. Mathematische Zeitschrift 275(3) (2013), 741-760.
Peter Hästö , A. Portilla, J.M. Rodríguez, E. Tourís. Gromov hyperbolicity of Denjoy domains through fundamental domains. Publicationes Mathematicae Debrecen 80/3-4 (2012), 295-310.
A. Portilla, Yamilet Quintana, J. M. Rodríguez, E. Tourís. Concerning asymptotic behavior for external polynomials associated to non-diagonal Sobolev norms. Journal of Function Spaces and Applications, Volume 2013 (2013), Article ID 628031, 11 pages.
P. Hästö, H. Linden, A. Portilla, J.M. Rodríguez, E. Tourís, Gromov hyperbolicity of Denjoy domains with hyperbolic and quasihyperbolic metrics. Journal of the Mathematical Society of Japan 64 (2012), 245-259.
A. Portilla, J.M. Rodríguez, E. Tourís, Structure Theorem for Riemannian surfaces with arbitrary curvature. Mathematische Zeitschrift. 271 (2012), 45-62.
A. Portilla, J.M. Rodríguez, E. Tourís, A very simple characterization of Gromov hyperbolicity for a special kind of Denjoy Domains. Journal of the Korean Mathematical Society 48 (2011), 565-583.
P. Hästö, A. Portilla, J.M. Rodríguez, E. Tourís, Uniformly separated sets and Gromov hyperbolicity of domains with the quasihyperbolic metric. Mediterranean Journal of Mathematics nº1, 8 (2011), 47-65.
A. Portilla, J.M. Rodríguez, E. Tourís, A real variable characterization of Gromov hyperbolicity of flute surfaces. Osaka Journal of Mathematics 48 (2011) 47-65.
A. Portilla, Y. Quintana, J.M. Rodríguez, E. Tourís, Zero location and asymptotic behavior for extremal polynomials with non-diagonal Sobolev norms. Journal of Approximation Theory 162 (2010), 2225-2242.
P. Hästö, A. Portilla, J.M. Rodríguez, E. Tourís, Gromov hyperbolic equivalence of the hyperbolic and the quasihyperbolic metrics in Denjoy domains. Bulletin London Mathematical Society 42 (2010), 282-294.
A. Portilla, J.M. Rodríguez, E. Tourís. The multiplication operator, zero location and asymptotic for non-diagonal Sobolev norms. Acta Applicandae Mathematicae 111 (2010), 205-218.
A. Portilla, J.M. Rodríguez, E. Tourís. Stability of Gromov hyperbolicity. Journal of Advanced Mathematical Studies 2 (2009), 1-20.
P. Hästö, A. Portilla, J.M. Rodríguez, E. Tourís. Comparative Gromov hyperbolicity results for the hyperbolic and quasihyperbolic metrics. Complex Variables and Elliptic Equations 55 (2010), 127-135.
A. Portilla, E. Tourís. A characterization of Gromov hyperbolicity of surfaces with variable negative curvature. Publicacions Mathematiques. 53 (2009), 83-110.
A. Portilla, Y. Quintana, J.M. Rodríguez, E. Tourís, Weierstrass' Theorem in weighted Sobolev spaces with k derivatives. The Rocky Mountain Journal of Mathematics 37 (2007) 1989-2024.
A. Portilla, Y. Quintana, J.M. Rodríguez, E. Tourís, Weierstrass' Theorem with first derivatives. Journal of Mathematical Analysis and Applications 334 (2007) 1167-1198.
V. Álvarez, A. Portilla, J.M. Rodríguez y E. Tourís, Gromov hyperbolicity of Denjoy Domains. Geometriae Dedicata 121 (2006) 221-245.
A. Portilla, Y. Quintana, J.M. Rodríguez y E. Tourís, Weierstrass’ Theorem in weighted Sobolev spaces with k derivatives; announcement of results. Electronic Transactions in Numerical Analysis 24 (2006) 103-107.
A. Portilla, J.M. Rodríguez y E. Tourís, The role of funnels and punctures in the Gromov hyperbolicity of Riemann surfaces. Proceedings of the Edinburgh Mathematical Society 49 (2006), 399-425.
A. Portilla, Y. Quintana, J.M. Rodríguez, E. Tourís, Weierstrass' Theorem with weights. Journal of Approximation Theory 127 (2004), 83-107.
A. Portilla, J.M. Rodríguez y E. Tourís, The topology of balls and Gromov hyperbolicity of Riemann surfaces. Differential Geometry and Applications 21 (2004), 317-335.
A. Portilla, J.M. Rodríguez y E. Tourís, Gromov hyperbolicity through decomposition of metric spaces II. The Journal of Geometric Analysis 14 (2004), 123-149.
D. Pestana, J.M. Rodríguez, E. Romera, E. Touris, V. Álvarez y A. Portilla, (Libro) Un Curso práctico de Cálculo y Precálculo, Ariel Ciencia (2000).