- Fri Dec 04, 2020 5:51 pm
Looks like you're skipping lunch! What you said looks perfect to me.
I think there are two ways to get to your result:
First way: Use the Unless Equation. "Without" is one of the four words (unless, except, until, without) that trigger the Unless Equation. To employ that equation, we follow these steps:
Step 1: Whatever "without" modifies is the necessary condition. So "a deep desire to communicate" is necessary.
Step 2: Negate the other part of the statement. That negation becomes the sufficient condition. The other part here is "No one...can be a blues musician." This is already negative. When we negate it, the double negations cancel, so we get, as a sufficient, "can be a blues musician."
That's your diagram.
Second way: Exploit the fact that the statement is structured as a "No thing with quality X has quality Y" conditional statement. "No thing with quality X has quality Y" is equivalent to "Anything with quality X lacks quality Y," or "If X then not-Y." So we get: "If you don't have a deep desire to communicate, you can't be a blues musician." You can keep that or contrapose it - the contrapositive says "If you are to be a blues musician, you must have a deep desire to communicate," which again gets diagrammed like what you said.