So it is indeed the case that our concavity of g switches as we cross x equals zero. We're concave upwards when x is less than zero, our second derivative is positive, and we are concave downwards when x is greater than zero. Let me write that a little bit. Downwards, downwards when x is greater than zero. So we are switching concavity as we cross x equals zero, and so this tells us that x, so let's see, we are switching signs, switching, let me say g prime prime, switching signs as we cross x equals zero, and our function is defined at x equals zero, and function defined at x equals zero. So we have an inflection point at x equals zero. So inflection point at x is equal to zero.