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CONGRUENCE PERMUTABLE SYMMETRIC EXTENDED DE MORGAN ALGEBRAS
Congruence permutable Extended Ockham algebra Symmetric extended de Morgan algebra
2007/12/12
An algebra $A$ is said to be {\it congruence permutable} if any two congruences on it are permutable. This property has been investigated in several varieties of algebras, for example, de Morgan algeb...
On the Normalizer of the Congruence Subgroup H05(I) of the Hecke Group H5
Normalizer Congruence subgroup Hecke group
2010/2/26
Let l = 2 cos \frac{p}{5} and let H5 be the Hecke group associated to l. In this paper, the normalizers of the congruence subgroups H05(I) in PSL(2Z[l]) are studied in the case where I = (2)aI ', (2, ...