Francisco Javier González-Acuña
Francisco Javier González-Acuña (nickname "Fico") is a mathematician in the UNAM's institute of mathematics and CIMAT, specializing in low-dimensional topology.

He did his graduate studies at Princeton University, obtaining his Ph.D. in 1970. His thesis, written under the supervision of Ralph Fox, was titled On homology spheres.

An early result of González-Acuña is that a group G is the homomorphic image of some knot group if and only if G is finitely generated and has weight at most one. This result  (a "remarkable theorem", as  Lee Neuwirth called it in his review),
was published in 1975 in the highly respected journal, Annals of Mathematics.  In 1978, together with José María Montesinos, he answered a question posed by Fox, proving the existence of 2-knots whose groups have infinitely many ends.

With Hamish Short, González-Acuña proposed and worked on the cabling conjecture: the only knots in the 3-sphere which admit a reducible Dehn surgery, i.e. a surgery which results in a reducible 3-manifold, are the cable knots.  This conjecture is one of the most relevant, unresolved questions in the theory of Dehn surgery on knots in the 3-sphere.

González-Acuña has made other significant contributions, which have been published in journals such as Transactions of the American Mathematical Society, Topology  and Mathematical Proceedings of the Cambridge Philosophical Society.

Fico Gonzalez Acuña school of knots and 3-varieties
The Fico Gonzalez Acuña School of knots and 3-varieties is aimed at the community of students in Mathematics, both at undergraduate and postgraduate levels. The objective of this school is to present to the students relevant information in the Topology in Low Dimension, mainly in the Theories of Knots and 3-Varieties, presenting interesting and current material that is not usually studied in ordinary courses of degree and masters. This is done through mini-courses and talks given by recognized experts in the area, as well as problem workshops, where students can solve exercises as well as propose new problems.

The school is usually realized at CIMAT, during the first days of December.

See also
CIMAT
UNAM

References
González-Acuña, F., Homomorphs of knot groups, Annals of Mathematics (2) 102 (1975), no. 2, 37–377.   
González-Acuña, F., Montesinos, José M., Ends of knot groups,  Annals of Mathematics (2) 108  (1978), no. 1, 91–96.  
González-Acuña, F.,  Short, Hamish, Knot surgery and primeness. Math. Proc. Cambridge Philos. Soc. 99 (1986), no. 1, 89–102. 
J.C. Gómez-Larrañaga, F.J. González-Acuña, J. Hoste. Minimal Atlases on 3-manifolds, Math. Proc. Camb. Phil. Soc. 109 (1991), 105–115.

External links
 portrait

 Unsolvability of word problems with knot groups, at arXiv-2010 and L'Enseignement Mathematique.
 https://www.cimat.mx/es/node/590
 https://escueladenudos.matem.unam.mx/
https://www.smm.org.mx/noticia/121/escuela-fico-gonzalez-acuna-de-nudos-y-3-variedades

Living people
Year of birth missing (living people)
Mexican mathematicians
20th-century Mexican mathematicians
20th-century mathematicians
21st-century mathematicians
Princeton University alumni
Topologists
National Autonomous University of Mexico faculty