Formal ethics is about the logic of ethics.
Formal ethics is about the logic of ethics.
Logic in a strict sense is about the validity of arguments; deontic logic, for example, focuses on the validity of arguments using "ought" or "right." Formal ethics doesn't do this; instead it is about formal moral principles. So formal ethics isn't about the logic of ethics in any strict sense of the word "logic."
However, people sometimes use "logic" in an extended sense that isn't about the validity of arguments. Formal ethics may be said to be about the "logic" of ethics in some such extended sense.
Formal ethics is about the logic of ethics.
Logic in a strict sense is about the validity of arguments; deontic logic, for example, focuses on the validity of arguments using "ought" or "right." Formal ethics doesn't do this; instead it is about formal moral principles. So formal ethics isn't about the logic of ethics in any strict sense of the word "logic."
However, people sometimes use "logic" in an extended sense that isn't about the validity of arguments. Formal ethics may be said to be about the "logic" of ethics in some such extended sense.