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Here is a solution. In the example i used english and french but it is same. The idea is \makeatletter \renewcommand{\thechapter}{% \ifodd\c@chapter \@roman\numexpr(\c@chapter+1)/2\relax% %roman just for the example \else \@arabic\numexpr\c@chapter/2\relax% %arabic just for the example \fi} \makeatother MWE \documentclass{book} ...



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