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How does one insert a backslash or a tilde into LaTeX?

I tried inserting symbols in latex. e.g.: \texttildelow

It didn't work. But symbols like \textasciitilde work.

I can't understand why some symbols work and others (the first one mentioned here) result in "undefined control sequence" error.

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marked as duplicate by Werner, Torbjørn T., Joseph Wright Oct 2 '11 at 7:12

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

up vote 4 down vote accepted

these symbols need the textcomp package:



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