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When cross-referencing an item in an enumerated list, should one use \ref or \eqref? For instance, suppose I have a theorem spread across two points, like below.

Theorem 4.3 Let x, y and z be real numbers. Then

(i) x + y = y + x;

(ii) (x + y) + z = x + (y + z).

Then should I refer to Theorem 4.3.i or Theorem 4.3.(i)?

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    I'd probably use 4.3(i) noextra dot as there is none in the theorem. Also, use enumitem for a better enumerate, then ref will carry whatever formatting you give the label, so no need for eqref (which are semantically wrong for items anyway) – daleif Jul 30 '19 at 22:08
  • eqred is pointless here, since you have no numbered equation. – Bernard Jul 30 '19 at 22:08
  • Please lift the "primarily opinion-based" hold on this posting. The OP's posting actually contains two separate questions. The narrow question, "should one write Theorem 4.3.i or Theorem 4.3.(i)?", is indeed mostly based on personal preferences. But there's also a much broader question contained in this posting. The broader question is "how do I create cross-references in a flexible and general manner, so that I can change the display format easily for the whole document with minimal additional effort?" I believe it's worth answering the broader question. – Mico Aug 2 '19 at 6:08

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