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"Let x be a real number and z a complex number"

"Let x be a real number and let z be a complex number"

"Let x be a real number and z be a complex number"

Which is (are) correct?

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2  
All of them are correct – Armen Ծիրունյան May 29 '12 at 10:21
3  
Why do you think any of them are incorrect? This reads like "please find my mistakes", which is off topic. Please read the faq for more info. – Matt Эллен May 29 '12 at 10:41
In principle it doesn't matter which one you use, because all of them are OK. Just note: If it is necessary for better understanding repeat the word (so the audience does not lose the context, e.g. in a longer sentence), but if elision simplifies the sentence omit those words. – Em1 May 29 '12 at 12:23

closed as off topic by Matt Эллен, Hugo, tchrist, Andrew Leach, cornbread ninja 麵包忍者 May 29 '12 at 14:06

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1 Answer

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To strengthen Armen's answer, they are all correct. The first one is what I have seen most often in Mathematics.

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