In America alone, people spent $170 billion on “direct marketing”—junk mail of both the physical and electronic varieties—last year. Yet of those who received unsolicited adverts through the post, only 3% bought anything as a result. If the bumf arrived electronically, the take-up rate was 0.1%. And for online adverts the “conversion” into sales was a minuscule 0.01%. That means about $165 billion was spent not on drumming up business, but on annoying people, creating landfill and cluttering spamfilters.
The collection of cofinite subsets ofℝ is afilter under inclusion: it includes the intersection of every pair of its members, and includes every superset of every cofinite set.
If (1) the universal set (here, the set of natural numbers) were called a "large" set, (2) the superset of any "large" set were also a "large" set, and (3) the intersection of a pair of "large" sets were also a "large" set, then the set of all "large" sets would form afilter.
(photography) A translucent object placed in the light path of a camera to remove certain wavelengths (colors), or a computer program that simulates such an effect.
The translations below need to be checked and inserted above into the appropriate translation tables. See instructions atWiktionary:Entry layout § Translations.
This strainer shouldfilter out the large particles.
1954, Alexander Alderson, chapter 5, inThe Subtle Minotaur[2]:
“You have probably never seen anything like this before, Mr. Toler. It isbaleen, or if you prefer it,whalebone, taken from the mouth of thebowhead whale. It is used by the whale tofilter its food.”
1992, Chris C. Bissell, David A. Chapman,Digital signal transmission (2nd edition), Cambridge University Press,→ISBN, page147:
Receivers often incorporate digital equalisers to 'mop up' slight intersymbol interference after initialfiltering at the receiver.
But fans’ emotions are no longerfiltered through ticket or album sales; they’re heard directly, constantly, at all hours, on all the platforms people visit to generate and extinguish bad feelings in a never-ending cycle.
The translations below need to be checked and inserted above into the appropriate translation tables. See instructions atWiktionary:Entry layout § Translations.
^Philippa, Marlies,Debrabandere, Frans, Quak, Arend, Schoonheim, Tanneke,van der Sijs, Nicoline (2003–2009)Etymologisch woordenboek van het Nederlands (in Dutch), Amsterdam: Amsterdam University Press
a device which separates a suspended, dissolved, or particulate matter from a fluid, solution, or other substance; any device that separates one substance from another
(electronics,physics) electronics or software that separates unwanted signals (for example noise) from wanted signals or that attenuates selected frequencies
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