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6

This makes an operator that will do what you wish, with a parameterized style that allows any letter to be put inside the summation: \documentclass{article} \usepackage{amsopn} \newcommand{\suminside}[1]{\operatorname*{\sum \mkern-14mu \makebox[0.77em][l]{\footnotesize #1}}} \begin{document} $$\suminside{k}_{i=0}^n a_i = 1$$ ...

12

At \scriptscriptstyle the output is not satisfying, but I don't think you need it. \documentclass{article} \usepackage{amsmath} \makeatletter \def\mov@rlay#1#2{\leavevmode\vtop{% \baselineskip\z@skip \lineskiplimit-\maxdimen \ialign{\hfil$\m@th#1##$\hfil\cr#2\crcr}}} \newcommand{\charfusion}[3][\mathord]{ #1{\ifx#1\mathop\vphantom{#2}\fi ...

9

% arara: pdflatex \documentclass{article} %\newcommand{\inSum}[1]{\mkern-15mu #1} % if you use that often, you can write \sum_{i=0}^{n}\inSum{j} or alike. Works only in in display math. \begin{document} $$\sum_{i=0}^{n}\mkern-16mu \mathrm{k} = \dots$$ \end{document} The \mathrm{} sets the letter in upright style. You may want ...

3

Is an overstrike allowed? If so, this restores the kerning. I don't comprehend the tooltip code, but tried to show what I mean in this MWE. The key to restoring the proper kerning is to start the \tooltip macro on #1 and end it on #1. I have EDITED to insert \relax after the \kerns, per the OP's warning. I have re-EDITED, based on comments from the OP. ...

5

First of all, \biggl. and \biggr. do exactly nothing, except introduce unwanted opening and closing atoms (and, possibly, the relative spacing). Second, \bigl/ makes the bigger / an opening atom, so you should use \big, instead. Third, the bigger / has wider sidebearings than the normal size symbol. If you need it only at normal and \big size, here's a ...

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