Advances within the physics and chemistry of low-dimensional platforms were fairly impressive within the previous few a long time. hundreds and hundreds of quasi-one-dimensional and quasi-two-dimensional structures were synthesized and studied. the most well-liked representatives of quasi-one-dimensional fabrics are polyacethylenes CH  and accomplishing donor-acceptor molecular crystals TIF z TCNQ. Examples of quasi-two-dimensional platforms are extreme temperature su perconductors (HTSC) in response to copper oxides LA2CU04, YBa2Cu306+y and natural superconductors according to BEDT -TIP molecules. The homes of such one- and two-dimensional fabrics will not be but absolutely understood. at the one hand, the equations of movement of one-dimensional sys tems are relatively easy, which enables rigorous strategies of version difficulties. nevertheless, manifestations of assorted interactions in one-dimensional structures are relatively abnormal. This refers, particularly, to electron--electron and electron-phonon interactions. Even in the restrict of a vulnerable coupling con stant electron--electron correlations produce an power hole within the spectrum of one-dimensional metals implying a Mott transition from steel to semiconductor nation. In these kinds of circumstances perturbation thought is inapplicable. that's one of many major problems at the approach in the direction of a finished concept of quasi-one-dimensional structures. - This assembly held on the Institute for Theoretical Physics in Kiev could 15-18 1990 was once dedicated to comparable difficulties. The papers chosen for this quantity are grouped into 3 sections.
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