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Explorations in document infrastructure, modern writing workflows, and collaborative ecosystems engineered by LetX.
Fix 'Missing $ Inserted' & Math-Mode Errors in LaTeX
'Missing $ inserted' means you used a math command outside math mode. Wrap the expression in $...$ or fix an unclosed dollar sign. Full causes and fixes inside.
Fix Overfull & Underfull \hbox Warnings in LaTeX
An 'Overfull \hbox' warning means a line is too wide to break cleanly, often a long word or URL. Fix it with hyphenation hints, microtype, or rewording.
How to Write Chemistry Formulas in LaTeX (mhchem)
To typeset chemical formulas in LaTeX, load mhchem and write \ce{H2O} or \ce{2H2 + O2 -> 2H2O}. It handles subscripts, charges, and reaction arrows.
How to Color Text & Tables in LaTeX (xcolor)
To color text in LaTeX, load the xcolor package and use \textcolor{red}{text}. Color table rows, cells, and define custom colors with HTML hex codes.
Write a Cover Letter & Academic Email in LaTeX
To write a cover letter in LaTeX, use the letter class or moderncv's letter mode for an address block, date, salutation, and signature. Templates inside.
Fix Common LaTeX Errors: Undefined Control Sequence
'Undefined control sequence' means LaTeX hit a command it doesn't recognize — usually a typo or a missing package. Here's the fix, plus the top 15 LaTeX errors.