... 97e:05058.Connects a problem on common covectors of two subspaces of Rm,andmoregenerally of a pair of oriented matroids, to the problem of sign-solvability of a matrix and the even-cycle problem for signed ... Cornu´ejols and Guenin (20xxa),Guenin (1998a), and Novick and Seb¨o (1995a) (qq.v.).(S(M), SG: M, G, I(Gen), O: Exp, Ref, Exr)G´erard Cornu´ejols and Bertrand Guenin20xxa On ideal binary clutters and ... Thm. 1.] (SG: Fr, Rand)S. Alexander and P. Pincus1980a Phase transitions of some fully frustrated models. J.Phys.A:Math.Gen.13, No.1 (1980), 263–273. (P: Phys)Kazutoshi Ando and Satoru Fujishige1996a...