Ruiz, Mari-Jo P.

Full Time
Contact No.: 
(+632) 426-6001 local 5681-83

PhD Mathematics (1981)
Ateneo de Manila University

Research Interest: 

Graph Theory
Operations Research



J. Akiyama, X. Chen, G. Nakamura, M. Ruiz. Minimum Perimeter Developments of the Platonic Solids. Thai Journal of Mathematics, 1, 1-10  (2011).

M. Kano, M. Ruiz, J. Urrutia. Jin Akiyama: a friend and his mathematics (on the occasion of his 60th birthday). Graphs and Combinatorics, 23 (S1), 1-39  (2007). DOI: 10.1007/s00373-007-0720-5.

J. Akiyama, K. Hirata, M. Ruiz, J. Urrutia. Flat 2-Foldings of Convex Polygons. In J. Akiyama, E.-T. Baskoro, M. Kano (Eds.), Lecture Notes in Computer Science: Combinatorial Geometry and Graph Theory, Proc. Indonesia – Japan Joint Conf. (IJCCGGT) 2003 LCNS 3330, Springer (2004). DOI: 10.1007/978-3-540-30540-8_2.

M. Ruiz. Is There Always Room in Hilbert’s Hotel?  --- A Look at the Structure of Infinity. Intersection, 2 (2), 2-14 (November 2001).

A. D. Garciano, I. J. L. Garces, M. Ruiz. On Perfect Cayley Graphs. Electronic Notes in Discrete Mathematics: The Ninth Quadrennial International Conference on Graph Theory, Combinatorics, Algorithms and Applications, 11, 653-680 (2002). DOI: 10.1016/S1571-0653(04)00112-X.

J. Akiyama, M. Ruiz. Complete arrangement of chessboards. The Bulletin of the Research Institute of Tokai University, 6, 99-111 (1998).

R. Marcelo, M. Ruiz, K. Shinoda, On automorphism groups of some PCS graphs, Journal of Graphs and Combinatorics, 19, 85–191 (1994), DOI: 10.1007/BF02986663.

R. Marcelo, M. Ruiz, On factors of uniform intersection graphs, SEA Bulletin of Mathematics, 16, 17–25 (1992).

M. Ruiz, Component Factorability of Point-Color-Symmetric Graphs, Annals of the New York Academy of Sciences, 576, 474–479 (1989), DOI: 10.1111/j.1749-6632.1989.tb16431.x.

M. Ruiz, On the construction of rhythmic graphs, SEA Bulletin of Mathematics, 4, 106-107 (1980).


J. Akiyama, M. Ruiz. A Day’s Adventure in Math Wonderland. World Scientific: Singapore (2008) (translated into Russian, Spanish, Japanese, Mandarin, Thai, Cambodian and Slovenian).

Selected Professional Associations, Awards and Recognition: 


Metrobank Award for Continuing Excellence and Service (ACES) (2004)

Distinguished Alumna in Education Award, College of the Holy Spirit Alumnae Foundation (2001)

Finalist, International Federation of Operational Research Societies (IFORS) Prize for Operational Research in Development (1999)

Achievement Awardee, Mathematical Sciences Division, National Research Council of the Philippines (NRCP) (1998)

Metrobank Outstanding Teacher Award (Tertiary Level) (1992)

Most Outstanding Teacher of the Year Award, given by the Arts and Sciences Parent’s Council (ASPAC) of the Ateneo de Manila University (1992)

The Mind Museum (Consultant), Network of Outstanding Teachers and Educators (Member), Philippine Council of Mathematics Teachers Education, Inc. (Member), Mathematical Society of the Philippines (Member), Operations Research Society of the Philippines (Member), National Research Council of the Philippines (Member)