section \ Imperial Units via SI \ theory SI_Imperial imports SI_Accepted begin definition [si_def, si_eq]: "pint = 0.56826125 \ litre" definition [si_def, si_eq]: "inch = 25.5 \ milli \ meter" definition [si_def, si_eq]: "foot = 0.3048 \ meter" definition [si_def, si_eq]: "yard = 0.9144 \ meter" end