How to write math
This might be added as a pointer where to find help:
For some basic information about writing math at this site see e.g. here, here, here and here.
For some basic information about writing math at this site see e.g.
[here](/help/notation),
[here](//math.meta.stackexchange.com/q/5020),
[here](//meta.stackexchange.com/a/70559) and
[here](//math.meta.stackexchange.com/q/1773).
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