Grommet be used purely decoratively for crafting. When used in sailing and various other applications, they are called cringles. Sometimes field workers refer to them as grunyons. If metal or another hard material has a hole made in it, the hole will probably have sharp edges. Electrical wires, cord, rope, lacings, or other soft vulnerable material passing through the hole can become abraded or cut, or electrical insulation may break due to repeated flexing at the exit point. Rubber, plastic or plastic coated metal grommets are used to avoid this. The grommet could also protect the wiring/cabling from contamination from dirt,
Linear equation over a ring multiplication) and for the above problems may be called a computable ring, or effective ring. One may also say that linear algebra on the ring is effective. The article considers the main rings for which linear algebra is effective. To be able of solving the syzygy problem, it is necessary that the module of syzygies is finitely generated, because it is impossible to output an infinite list. Therefore the problems considered here make sense only for Noetherian rings, or at least a coherent ring. In fact, this article is restricted to Noetherian integral domains because of the following result. "Given