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I am from a non-English speaking country. Should we say monotonous function or monotonic function?

Fernando Sampaio dos Aidos
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    Monotonic, definitely. Monotone is also fine. Monotonous in everyday usage means boring. – Brian M. Scott Apr 12 '15 at 13:53
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    So I guess nobody will be interested in monotonous functions. ;-) – celtschk Apr 12 '15 at 15:24
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    In Italian the difference is even worse. The difference is between the correct monotòne and monòtone. (0 letters difference, just the accent). – Bakuriu Apr 12 '15 at 16:57
  • Just for completeness, see: http://math.stackexchange.com/questions/365717/is-monotonous-ever-used-as-a-synonym-for-monotonic-in-math Apparently, the difference between monotonous and monotonic in some languages is minimal, and we see it often misused as "monotonous" here. – Thomas Andrews Nov 06 '15 at 17:10

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"Monotonic" or "monotone", but not "monotonous" (boring).

Unit
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That would be monotonic function. Monotonic is always used in relation to the function you are talking about.

http://mathworld.wolfram.com/MonotonicFunction.html

Monotonic describes something this is unchanged or altered, such as the function in maths whereas Monotonous describes something lacking in variety and is usually used in reference to tone.

Warlord5
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monotonic for sure is to be used. Monotonic functions are those functions which are either increasing or decreasing. They are such that for each specific value of x there is a unique y(value of function) which does not repeat for any other x.

dilpreet
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