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The sentence I'm struggling with is: 'What is elegant about this transpose operation, is that we can take transposes of entire blocks.'

I found something about a double copula at wiki double copula, but I'm not sure if it applies here.

Is my sentence correct?

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  • As I understand it, that's not a double copula, because the use of is is not successive. (The two instances do not exist side by side.) All of that aside, I think the sentence could be shortened; The elegance of this operation is that we can take transposes of entire blocks.
    – Jason Bassford
    Commented Jun 14, 2019 at 21:09

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The sentence is correct and is not a case of double copula. It is called a "pseudo-cleft sentence." I just don't find the comma to be correct:

  • What is elegant about this transpose operation is that we can take transposes of entire blocks.
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