Conclusion right.
4. Some epicures are ungenerous;
All my uncles are generous.
My uncles are not epicures.
Univ. “persons”; m = generous; x = epicures; y = my uncles.
xm′1 † y1m′0 ¶ xy′1 [Fig. II.
Conclusion wrong: right one is “Some epicures are not uncles of mine.”
5. Gold is heavy;
Nothing but gold will silence him.
Nothing light will silence him.
Univ. “things”; m = gold; x = heavy; y = able to silence him.
m1x′0 † m′y0 ¶ x′y0 [Fig. I.
Conclusion right.
6. Some healthy people are fat;
No unhealthy people are strong.
Some fat people are not strong.