x'_{0} + my'_{1} > xy'_{1} [Fig. II.

Conclusion wrong: right one is "Some fierce creatures do not drink
coffee."

13. No misers are generous;
Some old men are ungenerous.
Some old men are misers.

Univ. "persons"; m = generous; x = misers; y = old men.

xm_{0} + ym'_{1}

No Conclusion. [Fallacy of Unlike Eliminands with an Entity-Premiss.]

14. No fossil can be crossed in love;
An oyster may be crossed in love.
Oysters are not fossils.

Univ. "things"; m = things that can be crossed in love; x = fossils;
y = oysters.

xm_{0} + y_{1}m'_{0} > y_{1}x_{0} [Fig. I (a).

Conclusion right.
pg152
15. All uneducated people are shallow;
Students are all educated.
No students are shallow.

Univ. "people"; m = educated; x = shallow; y = students.

m'_{1}x'_{0} + y_{1}m'_{0} > xy'_{1} [Fig. III.

Conclusion wrong: right one is "Some shallow people are not students."

16. All young lambs jump;
No young animals are healthy, unless they jump.
All young lambs are healthy.

Univ. "young animals"; m = young animals that jump; x = lambs;
y = healthy.

x_{1}m'_{0} + m'y_{0}

No Conclusion. [Fallacy of Like Eliminands not asserted to exist.]

17. Ill-managed business is unprofitable;
Railways are never ill-managed.
All railways are profitable.

Univ. "business"; m = ill-managed; x = profitable; y = railways.

m_{1}x_{0} + y_{1}m_{0} > x'y'_{1} [Fig. III.

Conclusion wrong: right one is "Some business, other than railways, is
profitable."

18. No Professors are ignorant;
All ignorant people are vain.
No Professors are vain.

Univ. "people"; m = ignorant; x = Professors; y = vain.

xm_{0} + m_{1}y'_{0} > x'y_{1} [Fig. III.

Conclusion wrong: right one is "Some vain persons are not Professors."

19. A prudent man shuns hyaenas.
No banker is imprudent.
No banker fails to shun hyaenas.

Univ. "men"; m = prudent; x = shunning hyaenas; y = bankers.

m_{1}x'_{0} + ym'_{0} > x'y_{0} [Fig. I.

Conclusion right.

20. All wasps are unfriendly;
No puppies are unfriendly.
No puppies are wasps.

Univ. "creatures"; m = friendly; x = wasps; y = puppies.

x_{1}m_{0} + ym'_{0} > x_{1}y_{0} [Fig. I (a).

Conclusion incomplete: complete one is "Wasps are not puppies".

21. No Jews are honest;
Some Gentiles are rich.
So