I think it’s just one copy of the ψ—I don’t think Vanessa intended for ψ to be included in the Π product thing here. I agree that an extra pair of parentheses could have made it clearer. (Hope I’m not putting words in her mouth.)
I think it’s just one copy of the ψ—I don’t think Vanessa intended for ψ to be included in the Π product thing here. I agree that an extra pair of parentheses could have made it clearer. (Hope I’m not putting words in her mouth.)