public void SymbolFunctionDerivative()
{
var x = new Symbol("x");
var f = new SymbolFunction("f", x).D();
var g = new SymbolFunction("g", x, x).D(0).D(1).D(1);
Assert.AreEqual("f'[x]", f.ToString());
Assert.AreEqual("g<1,2>[x,x]", g.ToString());
}
public void SymbolFunctionString()
{
var x = new Symbol("x");
var f = new SymbolFunction("f");
var g = new SymbolFunction("g", x);
Assert.AreEqual("f[]", f.ToString());
Assert.AreEqual("g[x]", g.ToString());
Assert.AreEqual("f[x,x+1]", f._(x, x + 1).ToString());
}