Meaning of underfilter | Babel Free

Definitions

1. A morphological filter (idempotent operator) whose image is a subset of the domain.
2. A filter that is positioned beneath something.

Examples

“It is clear that overfilters and underfilters are dual in the sense of the duality principle.”

“The paving downstream consisted of 18x18x8-inch blocks laid on edge over a brick base which in turn was underlain with a gravel or brick chip filter. Since there was some controversy as to whether an underfilter was necessary, the first test was made with the filter omited.^([sic])”

“Since there is no underfilter, the top flow line emerges on the downstream slope.”

“A single sheet of filter paper is used as an underfilter.”

“In addition, the flow from the underfilter, which had previously been clear, became cloudy, indicating that the filter had failed to block particles from the core.”

CEFR level