What is m^2 in this case?
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The values (n,m) are (4,5), (5,11), and (7,71).
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m stands for?
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n and m are integers. No other constraints/requirements.
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I would like comma as decimal point (4,5 == 4.5) to be forbidden in any country still using it (Italy is one example). Can we trade it for universal adoption of metric units?

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I completely agree with you: as an Italian, I struggled so hard to understand what 4,5! means when it was actually 4 and 5 as separate numbers. I have to say that they should have separated the digit 5 and the comma, though.
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I'm <0 on maths. Could someone explain what is for / what does it mean ! in this case? Thanks.
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! Is for factorial. n!=n*(n-1)*(n-2).....*1 For instance 4!=4*3*2*1 for n an integer
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What is the 4,5! ?
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4,5 means n = 4 or n = 5, and not 4.5! :)
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