/// return true if successful
bool upDownInMath(bool up);
///
+ InsetMath & nextMath();
+ ///
+ InsetMath & prevMath();
+ /// move forward in math. word: whether to skip a whole "word" (insets with
+ /// the same mathclass)
+ bool mathForward(bool word);
+ ///
+ bool mathBackward(bool word);
+ ///
void plainErase();
///
void plainInsert(MathAtom const & at);