sub method
Implementation
MathComplex sub( dynamic r ){
if( r is MathComplex ){
return MathComplex( _re - r._re, _im - r._im );
}
return MathComplex( _re - ClipMath.toDouble(r), _im );
}
MathComplex sub( dynamic r ){
if( r is MathComplex ){
return MathComplex( _re - r._re, _im - r._im );
}
return MathComplex( _re - ClipMath.toDouble(r), _im );
}