TY  - GEN 
AU  - Moreno Frías, María Ángeles
A4  - Matemáticas
PY  - 2003
SN  - 0022-4049
UR  - http://hdl.handle.net/10498/35349
AB  - In this paper we develop the basic ideas of Janet by using the theory of D-modules. For the
so-called completely integrable systems (Janet Systems), we show that the higher Ext groups
are null
LA  - eng
PB  - Elsevier
KW  - D-modules
KW  - completely integrable system
KW  - Differential Operators
TI  - Ext groups of Janet systems
DO  - 10.1016/S0022-4049(02)00331-6
ER  -