# Publications

- Efren Ruiz,
*A classification theorem for direct limits of extensions of circle algebras by purely infinite C*-algebras*, J. Operartor theory,**58**(2) (2007), pp. 311-349. - Efren Ruiz,
*Homomorphisms and strong approximate unitary equivalence*, Indiana Univ. Math. J.,**56**no. 3 (2007), pp. 1333-1360. - Gunnar Restorff and Efren Ruiz,
*On Rørdam's classification of certain C*-algebras with one non-trivial ideal, II*, Math. Scand.,**101**(2) (2008), pp. 280-292. - Ping Wong Ng and Efren Ruiz,
*Extending maps in K-theory*, Int. J. Pure and Applied Math.,**41**no. 3 (2007), pp. 419-442. - Ping Wong Ng and Efren Ruiz,
*The automorphism group of a simple tracially AI algebra*, Comm. Math. Physics.,**280**(2008) no. 2, pp. 427-444. - Ping Wong Ng, Zhuang Niu, and Efren Ruiz,
*Simple unital C*-algebras with the stable local finite dimensional property*, J. Operator Theory,**61**(1) (2009), pp. 147-169. - Ping Wong Ng and Efren Ruiz,
*The structure of the unitary groups of certain simple C*-algebras*, Houston J. Math,**35**(4) (2009), pp. 1203-1232. - Søren Eilers, Gunnar Restorff, and Efren Ruiz,
*Classification of extensions of classifiable C*-algebras*, Adv. Math.,**222**(2009), no. 6, pp. 2153-2172. - Søren Eilers, Gunnar Restorff, and Efren Ruiz,
*On graph C*-algebras with linear ideal lattice*, Bull. Malays. Math. Sci. Soc.,**33**(2) (2010), pp. 233-241. - Ping Wong Ng and Efren Ruiz,
*Simplicity of the projective unitary group of the multiplier algebra of a simple stable nuclear C*-algebra*, Rocky Mountain J. Math.,**40**(2010), no. 5, pp. 1649-1665. - Søren Eilers, Gunnar Restorff, and Efren Ruiz,
*Nonsplitting in Kirchberg's ideal-related KK-Theory*, Canad. Math. Bull.,**54**(2011), no. 1, pp. 68-81. - Jeffrey L. Boersema and Efren Ruiz,
*Stability of real C*-algebras*, Canad. Math. Bull.,**54**, no. 4 (2011), pp. 593-606. - Jeffrey L. Boersema, Efren Ruiz, and P.J. Stacey,
*The classification of real purely infinite simple C*-algebras*, Documenta Math.,**16**(2011), pp. 619-655. - Sara E. Arklint, Gunnar Restorff, and Efren Ruiz,
*Filtrated $K$-theory for real rank zero C*-algebras*, Internat. J. Math.,**23**(2012), no. 8, 1250078, 19 pp. - Ping Wong Ng and Efren Ruiz,
*On the structure of the projective unitary group of the multiplier algebra of a simple stable C*-algebra*, J. Operator Theory,**68**(2012), pp. 549-565. - Søren Eilers, Efren Ruiz, and Adam Sørensen,
*Amplified graph C*-algebras*, Münster J. of Math.,**5**(2012), pp. 121-150. - Efren Ruiz and Mark Tomforde,
*Classification of unital simple Leavitt path algebras of infinite graphs*, J. Algebra,**384**(2013), pp. 45-83. - Ping Wong Ng and Efren Ruiz,
*The automorphism group of a simple Z-stable C*-algebra*, Trans. Amer. Math. Soc.,**365**(2013), pp. 4081-4120. - Søren Eilers, Gunnar Restorff, and Efren Ruiz,
*Classifying C*-algebras with both finite and infinite subquotients*, J. Funct. Anal.,**265**(2013), no. 3, pp. 449-468. - Efren Ruiz and Mark Tomforde,
*Ideal-related K-theory for Leavitt path algebras and graph C*-algebras*, Indiana Univ. Math. J.,**62**(2013), no. 5, pp. 1587-1620. - Søren Eilers, Takeshi Katsura, Efren Ruiz, and Mark Tomforde,
*Identifying AF-algebras that are graph C*-algebras*, J. Funct. Anal.,**266**(2014), pp. 3968-3996. - Søren Eilers, Gunnar Restorff, and Efren Ruiz,
*The ordered K-theory of a full extension*, Canad. J. Math.,**66**(2014), no. 3, pp. 596-625. - Efren Ruiz and Mark Tomforde,
*Ideals in graph algebras*, Algebr. Represent. Theory,**17**(2014), no. 3, pp. 849-861. - Efren Ruiz, Aidan Sims, and Mark Tomforde,
*The nuclear dimension of graph C*-algebras*, Adv. Math.,**272**(2015), pp. 96-123. - James Gabe, Mark Tomforde, Efren Ruiz, and Tristan Whalen,
*K-theory for Leavitt path algebras: computation and classification*, J. Algebra,**33**(2015), pp. 35-72. - Efren Ruiz, Aidan Sims, and Adam Sørensen,
*UCT-Kirchberg algebras have nuclear dimension one*, Adv. Math.,**279**(2015), pp. 1-28. - Sara E. Arklint and Efren Ruiz,
*Corners of Cuntz-Krieger algebras*, Trans. Amer. Math. Soc.,**367**(2015), no. 11, pp. 595-7612. - Søren Eilers, Gunnar Restorff, and Efren Ruiz,
*Corrigendum to "Classifying C*-algebras with both finite and infinite subquotients'' [J. Funct. Anal. 265 (2013) 449-468]*, J. Funct. Anal.,**270**(2016), no. 2, pp. 854-859. - Jeffrey L. Boersema, Terry A. Loring, and Efren Ruiz,
*Pictures of KK-theory for real C*-algebras and almost commuting matrices*, Banach J. Math. Anal.,**10**(2016), no. 1, pp. 27-47. - Søren Eilers, Xin Li, and Efren Ruiz,
*The isomorphism problem for semigroup C*-algebras of right-angled Artin monoids*, Doc. Math.**21**(2016), pp. 309-343. - James Gabe and Efren Ruiz,
*Classification of tight C*-algebras over the one-point compactification of N*, J. Operator Theory**76**(2016), no. 1, pp. 175-204. - Sara E. Arklint, Gunnar Restorff, and Efren Ruiz,
*Classification of real rank zero, purely infinite C*-algebras with at most four primitive ideals*, J. Funct. Anal.**271**(2016), no. 7, pp. 1921-1947. - Toke Meier Carlsen, Efren Ruiz, and Aidan Sims,
*Equivalence and stable isomorphism of groupoids, and diagonal-preserving stable isomorphisms of graph C*-algebras and Leavitt path algebras*, Proc. Amer. Math. Soc.,**145**, no. 4, pp. 1581--1592. - Toke Meier Carlsen, Gunnar Restorff, and Efren Ruiz,
*Efren Strong classification of purely infinite Cuntz-Krieger algebras*, Trans. Amer. Math. Soc. Ser. B 4 (2017), pp. 1--30.

# Conference Proceedings

- Søren Eilers, Gunnar Restorff, and Efren Ruiz,
*Classification of graph C^*-algebras with no more than four primitive ideals*, Operator algebra and dynamics, pp. 89-129, Springer Proc. Math. Stat., 58, Springer, Heidelberg, 2013.

# Publications with undergraduate students

- Damon Hay, Marissa Loving [
**UHH student**], Martin Montgomery, Efren Ruiz, and Katherine Todd [**UHH student**],*Non-stable K-theory for Leavitt path algebras*, Rocky Mountain J. Math.**44**(2014), no. 6, pp. 1817-1850.

# Publications to appear

- Søren Eilers, Gunnar Restorff, and Efren Ruiz,
*Ideal related K-theory with coefficients*, To appear in Houston J. Math., Preprint version can be found at http://arXiv.org/abs/1210.2737.pdf. - Sara E. Arklint, Søren Eilers, and Efren Ruiz,
*A dynamical characterization of diagonal preserving *-isomorphisms of graph C*-algebras*, Ergodic Theory and Dynamical Systems, Preprint version can be found at http://arXiv.org/abs/1605.01202.pdf. - Søren Eilers, Gunnar Restorff, Efren Ruiz, and Adam P.W. Sørensen,
*Filtered K-theory for graph algebras*, To appear in the conference proceedings from the MATRIX-program ``Refining C*-algebraic invariants for dynamics using KK-theory" in Creswick, Australia (2016). Preprint version can be found at http://arXiv.org/abs/1610.02232.pdf. - Søren Eilers, Gunnar Restorff, Efren Ruiz, and Adam P.W. Sørensen,
*Geometric classification of graph C*-algebras over finite graphs*, To appear in the Canadian Journal of Mathematics. Preprint version can be found at http://arXiv.org/abs/1604.05439.pdf. - Søren Eilers, Gunnar Restorff, Efren Ruiz, and Adam P.W. Sørensen,
*Invariance of the Cuntz splice*, To appear in Mathematische Annalen. Preprint version can be found at http://arXiv.org/abs/1602.03709.pdf.