New answers tagged dimension-expressions
The macro \strip@pt wants after it a dimension register; it will remove the final pt after the extracted value. In e-TeX, \dimexpr behaves as an “unnamed” dimension register, so it's good after \strip@pt. According to the syntax rules of \dimexpr, a dimension (implicit or explicit) inside it can be followed by * or / to denote multiplication or (rounded) ...
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