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How can I typeset a summation symbol with a two-line bottom? [duplicate]
I am using the amsmath and amssymb packages. Is it possible to type a summation with two lines of text under the symbol? Here is an screenshot example from a book I'm reading (which was clearly ...
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AMSsymb in ConTeXt
Where can I find some of the functionality, namely the symbols, from the LaTeX package AMSSymb in ConTeXt? For example, how do I place a \blacksquare? Is there an equivalent in ConTeXt? I didn't find ...