Preimage vs Primage - What's the difference?
preimage | primage |
(mathematics) The set containing exactly every member of the domain of a function such that the member is mapped by the function onto an element of a given subset of the codomain of the function. Formally, of a subset B'' of the codomain ''Y'' under a function ƒ, the subset of the domain ''X defined by
(archaic) A payment made for loading or unloading a ship, or for care of goods during transit by ship.
* 1818 , , The Political State of the British Empire , Volume 3,
(archaic, UK) An import duty levied by a guild of harbour pilots (especially at Kingston-upon-Hull and Newcastle-upon-Tyne) .
(Australia, New Zealand) An additional import duty levied by customs.
* 1932 , E. T. McPhee (Commonwealth Statistician), Official Year Book of the Commonwealth of Australia: No. 25 - 1932 ,
(engineering, rare) Droplets of water suspended in steam (especially in the cylinder of a steam engine).
* 1883 , Emory Edwards, Modern American Locomotive Engines: Their Design, Construction and Management ,
As nouns the difference between preimage and primage
is that preimage is the set containing exactly every member of the domain of a function such that the member is mapped by the function onto an element of a given subset of the codomain of the function. Formally, of a subset B of the codomain Y under a function ƒ, the subset of the domain X defined by while primage is a payment made for loading or unloading a ship, or for care of goods during transit by ship.preimage
English
(Function)Noun
(en noun)- For example, the preimage of {4, 9} under the squaring function is the set {?3,?2,+2,+3}.
Synonyms
* inverse imageprimage
English
Etymology 1
From primagium. (The French word post-dates the English.)Noun
(en noun)page 197,
- By the bill of lading the ma?ter undertakes to deliver the goods on payment of freight with primage and average accu?tomed.
- The rate of primage duty was subsequently increased to 4 per cent. as from the 6th November, 1930.
Etymology 2
From .Noun
(en noun)page 75,
- Of these temperatures, only one, the second, indicates primage ; all others exhibit a slight superheat.