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\chapter{Introducci\'on General} \textit{Oh, an empty article!}   You can get started by \textbf{double clicking} this text block and begin editing. You can also click the \textbf{Insert} button below to add new block elements. Or you can \textbf{drag and drop an image} right onto this text. Happy writing! \section{Variable Compleja}  Aca va...  \section{Ecuaciones Diferenciales}  Aca va ...  \section{M\'etodos Num\'ericos}  Aca va..