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I have product inside a fraction, like this:

    d \mid n,\\
    d<n.}} \phi_d(t)}

And that places the "limits" of the product on it's side, not behind, like it would normally do if it were not inside a fraction, like this

    d \mid n,\\
    d<n.}} \phi_d(t)

Is there a way to make it display the limits behind the product?

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up vote 6 down vote accepted

You may use \limits:


    d \mid n,\\
    d<n.}} \phi_d(t)}


enter image description here

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The reason is that fractions started in display style have their numerator and denominator in text style (where limits are set on the side rather than above and below); \limits is the correct answer; but probably I'd try a different way to express the identity. – egreg Dec 16 '13 at 21:12

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