In The Evitable Conflict the machines generalize the First Law to mean:No machine may harm humanity; or, through inaction, allow humanity to come to harm.This was refined in the end of Foundation and Earth, a zeroth law was introduced, with the original three suitably rewritten as subordinate to it:
A robot may not injure humanity, or, by inaction, allow humanity to come to harm.
Don’t forget the Zeroth Law:
In The Evitable Conflict the machines generalize the First Law to mean:No machine may harm humanity; or, through inaction, allow humanity to come to harm.This was refined in the end of Foundation and Earth, a zeroth law was introduced, with the original three suitably rewritten as subordinate to it:
A robot may not injure humanity, or, by inaction, allow humanity to come to harm.