Do I say "a damaged and a healthy model" or "a damaged and a damaged models"?

Question

"(...) representing a healthy and a damaged models."

Other examples: "Compute the subspace distances for each mode between the healthy and (the) damaged models.",

"Transfer function comparison between complete and nominal models."

Is there any difference if I put the definite article the before the terms?

I'm not sure why you'd want to say "a damaged and a damaged models". — Hot Licks, Jan 28 '17 at 21:55
A comparison between a damaged and a healthy model. No s. Or: A comparison between damaged and healthy models. Either a, no s, or use the a and leave out the a. — Lambie, Jan 28 '17 at 22:02

score 0 · Answer 1 · answered Jan 28 '17 at 22:36

The first one should be:

(...) representing a healthy and a damaged model.

You use the singular version of 'model' because you use the article, 'a', before your two examples of models ("a healthy and a damaged").

The reason why you use the plural 'models' in your "complete and nominal models" example is because you exclude the article, 'a'.

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