data/mathematical/4.mml
<math xmlns='http://www.w3.org/1998/Math/MathML' display='inline'><semantics><mrow><msub><mi>f</mi> <mi>c</mi></msub><mo stretchy="false">(</mo><mi>z</mi><mo stretchy="false">)</mo><mo>=</mo><msup><mi>z</mi> <mn>2</mn></msup><mo>+</mo><mi>c</mi></mrow><annotation encoding='application/x-tex'>f_c(z) = z^2 + c</annotation></semantics></math>