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 ...
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 ...