GTNyGA

Last updated on 2024-03-08

GTNyGA

Grupo de la teoría de los números y geometría algebraica.

	Lider

	Oscar F. Casas

Adriana López		Alex L. Rojas

Líneas de investigación

Análisis p-ádico
Funciones zeta locales, motívicas, topológicas
Modelos ultramétricos en física
Teoría aritmética de polinomios

Research Groups

Publications

Rodríguez-Vega, J.J., Oscar F. Casas (2024). Explicit formula in a imaginary quadratic number field. P-Adic Numbers, Ultrametric Analysis and Applications, 16, 401-412. doi:10.1134/S207004662404006X.

PDF Project DOI

Galeano-Peñaloza, J., Oscar F. Casas (2024). Radial solutions of a pseudo-differential equations associated with a $p$-adic non-local ultradiffusion operator. Journal of Pseudo-Differential Operators and Applications, 15(44). doi:10.1007/s11868-024-00614-1.

PDF Project DOI

Becerra Mayorga, W., Adriana López, Alex L. Rojas (2023). Python para las humanidades digitales. ECOE Editores. ISBN: 978-958-503-822-6.

Code Dataset Project

Arias-Sosa, L. A., Alex L. Rojas, Chavarro-Tulcán, I., Poveda-Diaz, N., Vargas-Puentes, J. (2023). Effect of management and probiotic supplementation on growth performance of Muscovy duck. Revista Colombiana De Ciencias Pecuarias, 36(3), 131-140 . doi:10.17533/udea.rccp.v36n3a2.

Adriana López, Alex L. Rojas (2023). Julia, Julia, Julia. Editorial UPTC. ISBN: 978-958-660-717-9.

Code Dataset Project DOI

Adriana López, Rojas-Peña, M. L., Alex L. Rojas (2022). Herramientas para el análisis estadístico de datos biológicos en R. Editorial UPTC. ISBN: 978-958-660-646-2.

Code Dataset Project DOI

Galeano-Peñaloza, J., Oscar F. Casas, Chacón-Cortés, L. F. (2022). Entropy, Feller Processes and $p$-Adic Analogues of the Scattering Equation. p-Adic Numbers, Ultrametric Analysis and Applications, 14(2), 103-115. doi:10.1134/s2070046622020029.

Oscar F. Casas, Chacón Cortés, L. F., Galeano-Peñaloza , J., Rodríguez Vega, J.J. (2022). Operadores no locales sobre los números $p$-ádicos. Editorial UPTC. ISBN: 978-958-660-621-9.

Moreno, L., Medina, O., Alex L. Rojas (2022). Mucilage and cellulosic derivatives as clarifiers for the improvement of the non-centrifugal sugar production process. Food Chemistry, 367, Art. 130657. doi:10.1016/j.foodchem.2021.130657.

Oscar F. Casas, Galeano-Peñaloza, J., Rodríguez-Vega, J. J. (2021). $p$-adic Markov process and the problem of the first return over balls. Ukrains’kyi Matematychnyi Zhurnal, 73(7), 902-912. doi:10.1007/s11253-021-01976-1.

Chavarro-Tulcán, I., Arias-Sosa, L. A., Alex L. Rojas (2021). Evaluation of metabolic syndromes and parasitic infection in Muscovy ducks under different management conditions. Tropical Animal Health and Production, 53(5), Art 493. doi:10.1007/s11250-021-02944-4.

PDF Project DOI

Adriana López, Alex L. Rojas (2021). Introducción a Python para estudiantes de ciencias. Editorial UPTC. ISBN: 978-958-660-530-4.

Code Dataset Project

Arias-Sosa, L. A., Alex L. Rojas (2021). A review on the productive potential of the Muscovy Duck. World’s Poultry Science Journal, 77(3), 565-588. doi:10.1080/00439339.2021.1921668.

Adriana López, Alex L. Rojas (2020). Una introducción concisa a la inferencia estadística. Editorial UPTC. ISBN: 978-958-660-414-7.

Code Dataset Project DOI

Oscar F. Casas, Chacón-Cortés, L. F., Galeano-Penaloza, J. (2020). Semi-linear Cauchy problem and Markov process associated with a $p$-adic non-local ultradiffusion operator. Journal of Pseudo-Differential Operators and Applications, 11, 1085-1110. doi:10.1007/s11868-020-00334-2.

Castellanos-Rozo J., Galvis-López J. A., Merchán Castellanos N., Manjarres-Hernándes, E., Alex L. Rojas (2020). Assessment of two sludge stabilization methods in a wastewater treatment plant in Sotaquirá, Colombia. Universitas Scientiarum, 25(1), 17-36. doi:10.11144/Javeriana.SC25-1.aots.

PDF Project DOI

Chacón-Cortés, L. F., Oscar F. Casas (2019). Non-radial functions, nonlocal operators and Markov processes over p-adic numbers. Universitas Scientiarum, 22(2), 381-406. doi:10.11144/javeriana.sc24-2.nrfn.

PDF Project DOI

Vika, M, Vulcani, B., Bamford, S.P., Häußler,B., Alex L. Rojas (2015). MegaMorph: classifying galaxy morphology using multi-wavelength Sérsic profile fits. Astronomy & Astrophysics, 577, A97. doi:10.1051/0004-6361/201425174.

PDF Project DOI

Oscar F. Casas, Rodriguez-Vega J. J. (2015). Parabolic type equations on $p$-adic balls. Boletin de Matematicas, 22(1), 97–106.

Oscar F. Casas, Galeano-Penaloza J., Rodriguez-Vega J. J. (2015). Tate gamma-factors attached to quadratic characters. Boletin de Matematicas, 22(2), 151–166.

Oscar F. Casas, Galeano-Peñaloza, J., Rodriguez-Vega, J.J. (2015). Parabolic-type pseudodifferential equations with elliptic symbols in dimension 3 over $p$-adics. P-Adic Numbers, Ultrametric Analysis, and Applications, 7, 1–16. doi:10.1134/S207004661501001X.

Vika, M, Bamford, S.P., Häußler, B., Alex L. Rojas (2014). MegaMorph – multiwavelength measurement of galaxy structure: physically meaningful bulge–disc decomposition of galaxies near and far. Monthly Notices of the Royal Astronomical Society, 444(4), 3603–3621. doi:10.1093/mnras/stu1696.

PDF Project DOI

Vulcani B., Bamford S.P., Häußler B., Vika M., Alex L. Rojas, Agius N.K., Baldry I., Bauer A.E, Brown M.J.I., Driver S.P., Graham A.W., Kelvin L.S., Liske J., Loveday J., Popescu C.C., Robotham A.S.G., Tuffs R.J. (2014). Galaxy And Mass Assembly: the wavelength-dependent sizes and profiles of galaxies revealed by MegaMorph. Monthly Notices of the Royal Astronomical Society, 441(2), 1340–1362. doi:10.1093/mnras/stu632.

PDF Project DOI

Oscar F. Casas, Zuniga-Galindo, W. A. (2014). $p$-Adic elliptic quadratic forms, parabolic-type pseudodifferential equations with variable coefficients and Markov processes. P-Adic Numbers, Ultrametric Analysis, and Applications, 6, 1–20. doi:10.1134/S2070046614010014.

Oscar F. Casas, Galeano-Penaloza J., Rodriguez-Vega J. J. (2014). The problem of the first return attached to a pseudodifferential operator in dimension 3. Revista Integracion, 33(2), 107–119. doi:10.18273/revint.v33n2-2015002.

PDF Project DOI

Vika, M, Bamford, S.P., Häußler,B., Alex L. Rojas, Borch, A., Nichols, R.C. (2013). MegaMorph – multiwavelength measurement of galaxy structure: Sérsic profile fits to galaxies near and far. Monthly Notices of the Royal Astronomical Society, 435(1), 623–649. doi:10.1093/mnras/stt1320.

PDF Project DOI

Oscar F. Casas, Zuniga-Galindo, W. A. (2013). Riesz Kernels and Pseudodifferential Operators Attached to Quadratic Forms over $p$-Adic Fields. P-Adic Numbers, Ultrametric Analysis, and Applications, 5, 177–193. doi:10.1134/S2070046613030011.

PDF Project DOI

Häußler,B., Bamford, S.P., Vika, M, Alex L. Rojas, Barden,M., Kelvin, L.S., Alpaslan, M., Robotham, A.S.G., Driver, S.P., Baldry, I.K., Brough, S., Hopkins, A.M., Liske, J., Nichol, R.C., Popescu, C.C., Tuffs, R.J. (2013). MegaMorph – multiwavelength measurement of galaxy structure: complete Sérsic profile information from modern surveys. Monthly Notices of the Royal Astronomical Society, 430(1), 330–369. doi:10.1093/mnras/sts633.

PDF Project DOI

Bamford, S.P., Alex L. Rojas, Nichol, R.C., Miller, C.J., Wasserman, L., Genovese, C.R., Freeman, P.E. (2008). Revealing components of the galaxy population through non-parametric techniques. Monthly Notices of the Royal Astronomical Society, 391(2), 607-616. doi:10.1111/j.1365-2966.2008.13963.x.

PDF Project DOI

Diler, R.S., Burleson Daviss, W., Adriana López, Axelson, D., Iyengar, S., Birmaher, B. (2007). Differentiating Major Depressive Disorder in Youths with Attention Deficit Hyperactivity Disorder. Journal of Affective Disorders, 102(1), 125-130. doi:10.1016/j.jad.2007.01.002.

PDF Project DOI

Brockwell, A.E., Alex L. Rojas, Kass, R.E. (2004). Recursive Bayesian Decoding of Motor Cortical Signals by Particle Filtering. Journal of Neurophysiology, 91(4), 1899-1907. doi:10.1152/jn.00438.2003.

PDF Project DOI

Pérez, A, Dennis, R.J., Gil, J.F., Rondón, M.A., Adriana López (2002). Use of the mean, hot deck and multiple imputation techniques to predict outcome in intensive care unit patients in Colombia. Statistics in Medicine, 21(24), 3885-3896. doi:10.1002/sim.1391.

PDF Project DOI

Acuña, E., Alex L. Rojas, Coaquira, F. (2002). Effect of Feature Selection on Bagging Classifiers Based on Kernel Density Estimators. In: Jajuga K., Sokołowski A., Bock HH. (eds) Classification, Clustering, and Data Analysis. Studies in Classification, Data Analysis, and Knowledge Organization. Springer. ISBN: 978-354-043-691-1. doi:10.1007/978-3-642-56181-8_17.

Corzo Salamanca J. A., Alex L. Rojas (1999). Una prueba basada en rachas para simetría alrededor de una mediana específica. Revista Colombiana de Estadística, 22(2), 39-53.