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numbering - How to have a single vertically centred equation number for multiline equation in LyX - TeX - LaTeX Stack Exchange
Possibility to align correctly and give numbering to a few formulas · Issue #2189 · KaTeX/KaTeX · GitHub
How to align a set of multiline equations - TeX - LaTeX Stack Exchange
9.3 Multiple Lines of Displayed Maths
numbering - How to have a single vertically centred equation number for multiline equation in LyX - TeX - LaTeX Stack Exchange
How to align equations in LaTeX? - LaTeX-Tutorial.com
