input: Inverse function

Not all functions have inverse functions. In order for a function f: X Y to have an inverse, it must have the property that for every y in Y there must be one, and only one x in X so that f(x) = y. This property ensures that a function g: Y X will exist having the necessary relationship with f.

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if a function is not one to one does it have an inverse
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output: no
Question: The building featured in the film, which was constructed on a sound stage in Burnaby, British Columbia, is based on the American Museum of Natural History in New York City, external shots of which were used in the movie. was night at the museum filmed at the field museum

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Answer: no
IN: The obverse of the Great Seal is used as the national coat of arms of the United States. It is officially used on documents such as United States passports, military insignia, embassy placards, and various flags. As a coat of arms, the design has official colors; the physical Great Seal itself, as affixed to paper, is monochrome.
does the us have a coat of arms?

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OUT: yes
What's the best answer to this question: does a notary have to be a lawyer?

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Answer: no
Text: There is no generally agreed definition of ''business casual''. One definition of business casual states that it includes khaki pants, slacks, and skirts, as well as short-sleeved polo shirts and long-sleeved shirts, but excludes jeans, tennis shoes, tight or short skirts, T-shirts, and sweatshirts. Another source, an American university careers service, states that business casual consists of neutral colors more towards the dark shades of black, gray, navy, but can include white and off white, and reminds that the clothing should be pressed and have clean, crisp seams. The ''Dress for Success'' advice from the University of Toronto sums up business casual as ''a classic, clean cut, and put together look where a full suit is not required,'' which means slacks, khakis, or skirts; blouses, polo shirts, or shirts with collar but no necktie; some sweaters; and closed-toe shoes. The Canadian university ends with the warning that ''it is not clothing you would wear to a club or for athletic purposes... Don't let the word casual mislead you. You still need to look professional.''

Question: can you wear a polo for business casual?

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Answer: yes
Problem: Text: Jan Stenerud (/stnrud/, Norwegian: (stenrd); born November 26, 1942) is a Norwegian former professional American football player for the AFL/NFL Kansas City Chiefs (1967--1979), Green Bay Packers (1980--1983), and Minnesota Vikings (1984--1985). He is the first pure placekicker to be inducted in the Pro Football Hall of Fame. Stenerud is distinguished as being the first Norwegian to play in the NFL.

Question: are there any punters in the hall of fame?

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A:
yes