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I'd like to suggest another solution using alignat. How does my solution differ from the other alignat solutions? I am using the colon of the text, the equals sign, and the \alpha as alignment points. I kept your \R macro and added the additional \ee macro which typesets Euler's number upright. Instead of \quad\quad you can use \qquad. In the future ...

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Yes you can use (expandable) tests in the beforeskip-argument: \documentclass{article} \newif\iflarge \makeatletter \renewcommand\section{\@startsection {section}{1}{\z@}% {\iflarge -6cm \else -3.5ex \@plus -1ex \@minus -.2ex\fi}% {2.3ex \@plus.2ex}% ...

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Is it safe to use leaders to test am I on the top of page? What do experts think? Previously I tried check \pagegoal, \maxdimen and \pagetotal, but it worked not 100%. \documentclass{article} \usepackage[showframe,paperwidth=10cm,paperheight=5cm]{geometry} \usepackage{amsmath} \usepackage{etoolbox} \makeatletter %% leaders should be discarded at top of ...

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Space which you observe is consequence of inner separation of node contens from its border. If you add to nodes option inner xsep=0pt, this space will disappear: \documentclass{article} \usepackage{amsmath} \usepackage{tikz} \newcommand{\MyTikzMarkNode}[2]{\tikz[remember picture,baseline]\node[anchor=base, inner xsep=0pt% by this ...

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Vertical spacing adjustments are unnecessary if you use the \cfrac machinery ("continued fractions") to typeset the complicated nested fraction expression. \documentclass[a4paper,fleqn,leqno]{article} \usepackage{polyglossia} \usepackage{fontspec} \usepackage[margin=2.54cm]{geometry} \usepackage{amsmath} \usepackage[fontsize=12]{scrextend} ...

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The key typographic difference between ... and \ldots is not anything to do with the width of a subsequent space. \ldots puts more spacing in between the dots. Observe: x...x\par x\dots x\par \bye renders as (note: in plain TeX \ldots is math-only, you have to use \dots in text mode.)

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