| Table of contents Integración - UIS vol.39 no.1 Bucaramanga Jan./June 2021 Original articles | | | | · Mappings between dendroids (fans) that (does not) preserve (non)contractibility Anaya, José G.; Capulín, Félix; Sánchez-Garrido, Mónica
| | | | · The dual of the reflection of a topological group Castillo, Adriana C.; Hernández A., Julio C.
| | | | · Properties of the Support of Solutions of a Class of 2-Dimensional Nonlinear Evolution Equations Bustamante, Eddye; Jiménez Urrea, José
| | | | · Global Solutions to Isothermal System with Source Wang, Xian-Ting
| | | | · Gray images of constacyclic codes over Galois rings R of nilpotency index 3 García-Ramírez, Angel R.; López-Andrade, Carlos A.; Villa-Hernández, David
| | | | · Topological Relations Angulo-Perkins, Emilio; Angoa-Amador, Juan
| | | | · Some special types of determinants in graded skew PBW extensions Suárez, Héctor; Cáceres, Duban; Reyes, Armando
| | | | · Weighted graphs and stable maps of 3-manifolds in R 3 Huamaní, Nelson B.; Mendes de Jesus, Catarina
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