void write(final DataOutput out) throws IOException {
		final byte[] data = toString().getBytes(UTF_8);
		writeInt(data.length, out);
		out.write(data);
	}
Simplifies {@code this} expression by applying the default
{@link #REWRITER}.

@return a newly created math expression object
jenetics.prog/src/main/java/io/jenetics/prog/op/MathExpr.java