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I have just started reading about fitness landscapes and I couldn't understand what the peak means. What does the peak mean?

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It's just the ordinary English-language meaning of the word:

peak, n.
[...] 4 a (1) : the top of a hill or mountain ending in a point
Merriam-Webster

See, for example, Wikipedia:

Fitness landscapes are often conceived of as ranges of mountains. There exist local peaks (points from which all paths are downhill, i.e. to lower fitness) and valleys (regions from which many paths lead uphill).

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  • $\begingroup$ Does that mean the peak is a solution to the problem? $\endgroup$ – Adam Amin Aug 22 '18 at 11:01
  • $\begingroup$ Depending on context, it may be a solution. But the best solution is Mount Everest; you might be standing on top of some other mountain and you gotta go back down before you can get there. $\endgroup$ – David Richerby Aug 22 '18 at 11:03

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