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I'm studying organic chemistry from John McMurry's book. Double bond's substituents can be on cis or trans configuration. An example for cyclic molecules is trans-cyclooctene and cis-cyclooctene, where the cis compound is more stable. On the other hand, in a naming exercise this molecule is named simple as -cyclohexene. None of the other molecules in the same exercise was named as cis or trans.

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So, my question is: In small rings is not necessary to specify cis or trans orientation because the trans orientation is less stable (maybe impossible to obtain)?

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    $\begingroup$ Impossible to obtain trans in rings smaller than 8-membered $\endgroup$ – Waylander Jun 9 '20 at 16:46
  • $\begingroup$ IUPAC nomenclature does not use E/Z (cis/trans) for rings smaller than 8-membered. $\endgroup$ – user55119 Jun 9 '20 at 18:40
  • $\begingroup$ Can one of you post as response and I will accept it. $\endgroup$ – Francisco Angel Jun 9 '20 at 22:04
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Both @Waylander's and my Comment are true as well as your conclusion. From the IUPAC Blue Book 2013:

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