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I have seen the symbol $\subsetneqq$ in a Probability exercise. What is it used for? In the exercise it seemed to mean "proper subset of", but then in what is it different from $\subsetneq$?

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  • $\begingroup$ It's equivalent, just another choice of notation. $\endgroup$ – aes Nov 22 '14 at 20:22
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    $\begingroup$ It has the same meaning as $\subsetneq$, but the strike-through in $\subsetneqq$ is more difficult to overlook. $\endgroup$ – Daniel Fischer Nov 22 '14 at 20:22
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There is no difference between the two. The author simply chose to use different notation.

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