2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148657We review White's density matrix renormalisation group method, an increasingly popular method for the solution of low dimensional quantum Hamiltonians. We describe some applications to frustrated spin systems, quantum critical phenomena, two dimensional classical and one dimensional quantum systems at non-zero temperature, and low energy properties of two dimensional quantum models such as the Hubbard and Heisenberg Hamiltonians.14 pages, Standard Latex File + 4 PostScript figures available on request. To appear in Acta Physica Polonica. Corrects some referencesCondensed Mattertext