![]() This immediately rules out the use of | and \| for delimiters, because left and right delimiters are distinct usages that do not relate in the same way to adjacent symbols recommended practice is therefore to define suitable commands in the document preamble for any paired-delimiter use of vert bar symbols: \providecommand to produce ∥v∥. It is recommended therefore that there should be a one-to-one correspondence in any given document between the vert bar character | and a selected mathematical notation, and similarly for the double-bar command \|. Notice that the positions depend only on the direction of the arrow, the absolute notions of up, down, etc. The multiplicity of uses in itself is not so bad what is bad, however, is that fact that not all of the uses take the same typographical treatment, and that the complex discriminatory powers of a knowledgeable reader cannot be replicated in computer processing of mathematical documents. ized as sub- and superscripts on arrows such that they are placed in the usual positions (as limits), i.e., reads above and below on an arrow pointing right. This character is currently used in LaTeX documents to represent a wide variety of mathematical objects. The amsmath package provides commands \lvert, \rvert, \lVert, \rVert (compare \langle, \rangle) to address the problem of overloading for the vert bar character |. #Textbar meaning such that in latex how toLet me quote from the guide to the amsmath package (the document known as amsldoc), section 4.14.2 Vertical bar notations: Queries related to box text paragraph latex latex text latex boxed text latex box textbox latex text above text latex boxes in latex how to make a box. This is similar in spirit to qbi's answer. ![]()
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