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Apr 23, 2020 at 4:06 comment added Wlod AA @LSpice, very nice, thank you. However, $\ \subsetneq\ $ is not aesthetic and it LOOKS ambiguous, it may be visually interpreted as "not contained": $\ Y\setminus X\ne\emptyset.\ $ (True, there is a special notation for this too but nevertheless...).
Apr 23, 2020 at 3:58 comment added LSpice You can use $\subsetneq$ \subsetneq for proper inclusion, to avoid needing a separate qualifier afterwards.
Apr 23, 2020 at 3:35 history answered Wlod AA CC BY-SA 4.0