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We study the problem of folding of the regular triangular lattice in the presence of bending rigidity K and magnetic field h (conjugate to the local normal vectors to the triangles). A numerical study of the transfer matrix of the problem shows the existence of three first order transition lines in the (K,h) plane separating three phases: a folded phase, a phase frozen in the completely flat configuration (with all normal vectors pointing up) and its mirror image (all normal vectors pointingdoi:10.1103/physreve.50.4418 pmid:9962523 fatcat:3mkn5x5ttbe2vpufaxesupsy5y