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WD_188/ 2005
(  Satoshi Kinoshita )
| Series: | Works on paper: Drawings 2 | | Medium: | oilstick on paper | | Size (inches): | 25 x 19.9 | | Size (mm): | 640 x 510 | | Catalog #: | WD_0188 | | Description: | Signed, date and copyright in pencil on the reverse.
Time flies like an arrow; fruit flies like a banana.
-Groucho Marx
Ambiguity:
A word, phrase, sentence, or other communication is called ambiguous if it can be interpreted in more than one way. Ambiguity is distinct from vagueness, which arises when the boundaries of meaning are indistinct.
Lexical ambiguity arises when context is insufficient to determine the sense of a single word that has more than one meaning. For example, the word "bank" has several meanings, including "financial institution" and "edge of a river", but if someone says "I deposited $100 in the bank", the intended meaning is clear. More problematic are words whose senses express closely related concepts. "Good", for example, can mean "useful" or "functional" (That's a good hammer), "exemplary" (She's a good student), "pleasing" (This is good soup), "moral" (He is a good person), and probably other similar things. "I have a good daughter" isn't clear about which sense is intended.
Syntactic ambiguity arises when a sentence can be parsed in more than one way. "He ate the cookies on the couch", for example, could mean that he ate those cookies which were on the couch (as opposed to those that were on the table), or it could mean that he was sitting on the couch when he ate the cookies. Spoken language can also contain lexical ambiguities, where there is more than one way to break up a set of sounds into words, for example "ice cream" and "I scream". This is rarely a problem due to the use of context. (For more information, see Syntactic ambiguity.)
Philosophers (and other users of logic) spend a lot of time and effort searching for and removing ambiguity in arguments, because it can lead to incorrect conclusions and can be used to deliberately conceal bad arguments. For example, a politician might say "I oppose taxes which hinder economic growth". Some will think he opposes taxes in general because they hinder economic growth; others will think he opposes only those taxes that he believes will hinder economic growth (although in writing, the correct insertion or omission of a comma after "taxes" removes ambiguity here). The politician hopes that each will interpret the statement in the way he wants, and both will think the politician is on his side. The logical fallacies of amphiboly and equivocation also rely on the use of ambiguous words and phrases.
In literature and rhetoric, on the other hand, ambiguity can be a useful tool. Groucho Marx's classic joke depends on a grammatical ambiguity for its humor, for example: Last night I shot an elephant in my pajamas. What he was doing in my pajamas I'll never know. Songs and poetry often rely on ambiguous words for artistic effect, as in the song title "Don't It Make My Brown Eyes Blue" (where "blue" can refer to the color, or to sadness).
In music pieces or sections which confound expectations and may be or are interpreted simultaneously in different ways are ambiguous, such as some polytonality, polymeter, other ambiguous meters or rhythms, and ambiguous phrasing, or (Stein 2005, p.79) any aspect of music. The music of Africa is often purposefully ambiguous. To quote Sir Donald Francis Tovey (1935, p.195), "Theorists are apt to vex themselves with vain efforts to remove uncertainty just where it has a high aesthetic value."
Some languages have been created with the intention of avoiding ambiguity, especially syntactic ambiguity. Lojban and Loglan are two nearly identical languages which have been created with the intention of being clear and impossible to misunderstand. The languages can be both spoken and written. Their unambiguity makes them better suited than natural languages for use in communication between humans and computers.
-Wikipedia, the free encyclopedia/ en.wikipedia.org/wiki/Ambiguity
Syntactic ambiguity:
Syntactic ambiguity is a property of sentences which may be parsed in more that one way. It may or may not involve one word having two parts of speech or homonyms. Here are some examples:
Bear left at zoo. (Do you turn left when you get to the zoo, or did someone leave a bear there?)
I'm going to sleep. ("Going" can be a verb with destination "sleep" or an auxiliary indicating near future. There is little difference in meaning between the two parses.)
The word of the Lord came to Zechariah, son of Berekiah, son of Iddo, the prophet. (Which of the three is the prophet?)
British Left Waffles on Falklands (Did the British leave waffles behind, or was there waffling by the British Left?)
The cow was found by a stream by a farmer. (The farmer found the cow; she was located by a stream.)
An important example in the field of computer natural language processing is Time flies like an arrow. Although humans unambiguously understand it to mean "Time flies in the same way that an arrow does," it could also mean
* "Measure the speed of flies as you would for an arrow,"
* "Measure the speed of flies as an arrow would," or even
* "A kind of fly, the time fly, likes arrows."
(As Groucho Marx is said to have observed, "Time flies like an arrow; fruit flies like a banana.")
-Wikipedia, the free encyclopedia/ en.wikipedia.org/wiki/Syntactic_ambiguity
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