Dear all, Sometime ago, I asked about the splitting the long formula. Since it is seldom to have a long formula, I manually break the formula using \startformula\startalign … formula \stopalign\stopformula \startformula\startalign … formula \stopalign\stopformula at the final stage of editing. It is more economical than to make some functions for this purpose, I think. Thank you for reading. Best regards, Dalyoung