Διαδικασία Αχλιόπτα
 Στα τελευταία χρόνια, έχουν δημοσιευτεί πολλές δημοσιεύσεις, εργασίες και άλλα για την διαδικασία Αχλιόπτα. Achlioptas, D., R.M. D’Souza, and J. Spencer, Explosive percolation in random networks, Science 323 (2009), 1453–1455. Achlioptas, D., and A. Naor, The two possible values of the chromatic number of a random graph, Ann. of Math. (2) 162 (2005), 1335–1351. Addario-Berry, L., N. Broutin and C. Goldschmidt, The continuum limit of critical random graphs, Probab. Theory Related Fields 152 (2012), 367–406. Aiello, W., F. Chung and L. Lu, A random graph model for power law graphs, Experiment. Math. 10 (2001), 53–66. Albert, R., and A.-L. Barabási, Statistical mechanics of complex networks, Rev. Mod. Phys. 74 (2002), 47–97. Albert, R., H. Jeong and A.-L. Barabási, Diameter of the world-wide web, Nature 401 (1999), 130–131. Aldous, D., Brownian excursions, critical random graphs and the multiplicative coalescent, Ann. Probab. 25 (1997), 812–854. Alon, N., S. Friedland and G. 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Η διαδικασία Αχλιόπτα δημιουργήθηκε το 2000, από πρόταση του Δημήτρη Αχλιόπτα σε εργαστήριο του Ινστιτούτου Φιλντς. Είναι η γενικοποίηση μιας κοινής διαδικασίας σχηματισμού ενός τυχαίου γραφήματος Έρντους-Ρένι. Ο Αχλιόπτας πρότεινε μια τάξη μεταβλητών στην διαδικασία τυχαίου γραφήματος G ~ n {\textstyle {\widetilde {G}}_{n}} , η οποία περιγράφεται ως εξής: Ξεκινώντας με το άδειο γράφημα με n {\textstyle n} κορυφές και χωρίς καμία άκρη. Σε κάθε βήμα, δύο πιθανές άκρες e 1 {\textstyle e_{1}} και e 2 {\textstyle e_{2}} , επιλέγονται ανεξάρτητα και ομοιόμορφα τυχαία από όλες τις πιθανές άκρες ( n 2 ) {\textstyle {\binom {n}{2}}} (ή από τις άκρες που δεν είναι πάντα παρόντες). Μία από αυτές τις άκρες επιλέγεται σύμφωνα με κάποιον κανόνα R {\textstyle {\mathcal {R}}} και προστίθεται στο γράφημα.. Το αποτέλεσμα είναι μια διαδικασία τυχαίου γραφήματος G ~ n R {\textstyle {\widetilde {G}}_{n}^{\mathcal {R}}} του οποίου η διανομή στη διαδρομή εξαρτάται από τον κανόνα R {\textstyle {\mathcal {R}}} . Αυτές οι διαδικασίες λέγονται διαδικασίες Αχλιόπτα. Βεβαίως, αν επιλεγεί ένα e 1 {\textstyle e_{1}} , δίνει (ακριβώς ή προσεγγιστικά, ανάλογα με τους ακριβείς ορισμούς), την κλασική διαδικασία τυχαίου γραφήματος G ~ n {\textstyle {\widetilde {G}}_{n}} . Η αρχική ερώτηση του Αχλιόπτα ήταν εάν κάποιος μπορεί να μεταβάλλει το κρίσιμο σημείο της διαδικασίας τυχαίου γραφήματος επιλέγοντας ένα κατάλληλο κανόνα.