/// can this change its number of rows?
bool rowChangeOK() const;
/// can this change its number of cols?
bool colChangeOK() const;
/// are any of the equations numbered?
bool haveNumbers() const;
/// can this change its number of rows?
bool rowChangeOK() const;
/// can this change its number of cols?
bool colChangeOK() const;
/// are any of the equations numbered?
bool haveNumbers() const;