a point of a net having the property that the net is frequently in each neighborhood of the point.
a point of a filter having the property that every neighborhood of the point has points in common with every set in the filter.
noun, Astronomy. 1. .
[kluhch] /klʌtʃ/ verb (used with object) 1. to seize with or as with the hands or claws; snatch: The bird swooped down and clutched its prey with its claws. 2. to grip or hold tightly or firmly: She clutched the child’s hand as they crossed the street. 3. Slang. to spellbind; grip a person’s emotions, […]
noun 1. 1 (def 15).