virtual InsetMathSymbol const * asSymbolInset() const { return 0; }
virtual InsetMathUnknown * asUnknownInset() { return 0; }
virtual InsetMathUnknown const * asUnknownInset() const { return 0; }
virtual InsetMathSymbol const * asSymbolInset() const { return 0; }
virtual InsetMathUnknown * asUnknownInset() { return 0; }
virtual InsetMathUnknown const * asUnknownInset() const { return 0; }