Guide Vert Toscane Ombrie

Qui ne fantasme pas sur les paysages délicats et verdoyants de la Toscane ou, tout aussi poétiques mais plus discrets de sa voisine Ombrie ? Elles ont en commun les verts des forêts et des collines, ...

Il émane une belle sérénité du Vocabolo Moscatelli (vocabolo signifie hameau en dialecte ombrien, NDLR), base idéale pour découvrir l'Ombrie et rayonner dans le sud de la Toscane (Arezzo est à moins d ...

According to texdoc symbols: \mvert and \mid are identical and produce a relation. \vert is a synonym for | and both produce the same symbol, but should be used in the context of an ordinal, and should be used as an operator, not as a delimiter (p54, bottom). \divides once again produces the same symbol but should be used as a binary “divides” operator. \lvert and \rvert are left and right ...

As you can see, the top formula has \vert size as default. I want the latter formula, How do I change my command? I can't use the \left and \right command because there is no left or right in \vert. Any help is appreciated.

How can I change the size of \vert accordingly like \left and ... - TeX

In short, \bigl\vert \bigr\vert is definitely better than \big\vert \big\vert, typographically speaking, as it produces the correct spacing in all cases. A final remark, prompted by a comment from barbara beeton: For the code examples used here, it's not necessary to increase the size of the vertical bars.

math mode - Use \big\vert f (x) \big\vert or `\big\lvert f (x) \big ...