Wonder, in which textbooks is a proof/derivation of formula of Euler's totient function by the use inclusion-exclusion principle from combinatorial analysis.
Putting references below this post very appreciated!
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Martin Sleziak
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MIT
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I will add a combinatorial proof on my post on your previous post. – Bérénice Apr 09 '16 at 13:42
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Thanks! Looking forward to seeing it :) – MIT Apr 09 '16 at 13:43
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See this question. – Dietrich Burde Apr 09 '16 at 13:45
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Saw that. But simply due to curiosity I wonder about which textbooks mention this problem. – MIT Apr 09 '16 at 13:47
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My answer is edited – Bérénice Apr 09 '16 at 14:05