2-FIBRADO VECTORIAL 2-VECTOR BUNDLE ALGEBRAS DE LIE DE DIMENSION INFINITA ALGEBRAS DE MULTILAZOS BRST cohomology DESCENSO DE GALOIS DESCENSO FIELMENTE PLAYO FAITHFULLY FLAT DESCENT FIBRADO VECTORIAL TORCIDO FORMAS BILINEALES INVARIANTES FORMAS TORCIDAS FUNCTOR ESTABLE POR CAMBIO DE BASE FUNCTORS STABLE UNDER BASE CHANGE GALOIS DESCENT Gauge principle INFINITE-DIMENSIONAL LIE ALGEBRAS INVARIANT BILINEAR FORM MANIFOLD WITH MULTIPLICATION MULTILOOP ALGEBRAS OPEN-CLOSED FIELD THEORY RECUBRIMIENTO ESPECTRAL SPECTRAL COVER TEORIA DE CAMPOS ABIERTA-CERRADA TWISTED FORM TWISTED VECTOR BUNDLE VARIEDAD CON MULTIPLICACION