Complete as directed in the lecture using red for subject and blue for predicate to separate the propositions in your mind's eye. You Only need to do Exercises A, B & C (Problems 1, 2, 4). You do not have to do Exercise D, E, F and G. Please refer to the Conversion Key Attached as an image!

A = Universal Affirmative = All S is P E = Universal Negative = No S is P

I = Particular Affirmative = Some S is P O = Particular Negative = Some S is not P

EXERCISE A INSTRUCTIONS

State the converses of the following propositions, and indicate which of them are equivalent to the given propositions:

PROBLEMS

1. No people who are considerate of others are reckless drivers who pay no attention to traffic regulations.

2. All graduates of West Point are commissioned officers in the U.S. Army.

3. Some European cars are overpriced and underpowered automobiles.

4. No reptiles are warm-blooded animals.

5. Some professional wrestlers are elderly persons who are incapable of doing an honest days work.

EXERCISE B INSTRUCTIONS

State the obverses of the following propositions:

PROBLEMS

1. Some college athletes are professionals.

2. No organic compounds are metals.

3. Some clergy are not abstainers.

4. No geniuses are conformists.

5. All objects suitable for boat anchors are objects that weigh at least fifteen pounds.

EXERCISE C INSTRUCTIONS

State the contrapositives of the following propositions and indicate which of them are equivalent to the given propositions.

PROBLEMS

1. All journalists are pessimists.

2. Some soldiers are not officers.

3. All scholars are nondegenerates.

4. All things weighing less than fifty pounds are objects not more than four feet high.

5. Some noncitizens are not nonresidents.

Valid Conversions Key Convertend Converse A: All Sis P. 1: Some P is S. (by limitation) E: No S is P. E: No P is s. I: Some Sis P. 1: Some P is S. O: Some S is not P. so the conversion is not valid. Obversions Key Obvertend A: All S is P. E: No S is P. I: Some Sis P. 0: Some S is not P. Obverse E: No S is non-P. A: All S is non-P. O: Some S is not non-P. 1: Some S is non-P. Contraposition Key Premise A: All S is P. E: No S is P. I: Some S is P. O: Some S is not p. Contrapositive A: All non-P is non-s. O: Some non-P is not non-S. (by limitation) Contraposition is not valid. O: Some non-P is not non-s. Valid Conversions Key Convertend Converse A: All Sis P. 1: Some P is S. (by limitation) E: No S is P. E: No P is s. I: Some Sis P. 1: Some P is S. O: Some S is not P. so the conversion is not valid. Obversions Key Obvertend A: All S is P. E: No S is P. I: Some Sis P. 0: Some S is not P. Obverse E: No S is non-P. A: All S is non-P. O: Some S is not non-P. 1: Some S is non-P. Contraposition Key Premise A: All S is P. E: No S is P. I: Some S is P. O: Some S is not p. Contrapositive A: All non-P is non-s. O: Some non-P is not non-S. (by limitation) Contraposition is not valid. O: Some non-P is not non-s