1<!DOCTYPE math PUBLIC "-//W3C//DTD MathML 2.0//EN" "http://www.w3.org/Math/DTD/mathml2/mathml2.dtd"> 2<math xmlns="http://www.w3.org/1998/Math/MathML"/> 3
1<!DOCTYPE math PUBLIC "-//W3C//DTD MathML 2.0//EN" "http://www.w3.org/Math/DTD/mathml2/mathml2.dtd"> 2<math xmlns="http://www.w3.org/1998/Math/MathML"/> 3