Logic and Proofs: Chapters 1-3

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Questions and Answers

What is the statement form which is always true called?

  • Negation
  • Contradiction
  • Reductio ad absurdum
  • Tautology (correct)

In indirect proof methods, we begin by affirming the conclusion.

False (B)

What is the name for a proposition that states that an individual has a certain property?

singular proposition

The rule of inference can only be applied to the ________ statement.

<p>whole</p> Signup and view all the answers

Match the following terms with their descriptions in predicate logic:

<p>Universal Quantifier = The expression 'Given anything' Existential Quantifier = The expression that there is at least one x Free variable = Variable not preceded by a quantifier Predicate Constant = Stands for specific property/attribute</p> Signup and view all the answers

Which of the following is considered the founder of traditional logic?

<p>Aristotle (B)</p> Signup and view all the answers

In an E proposition, only the subject term is distributed.

<p>False (B)</p> Signup and view all the answers

What type of premise contains the predicate term in a syllogism?

<p>major premise</p> Signup and view all the answers

Flashcards

STTM

An indirect method of decision procedure based on reductio-ad-absurdum.

Negation

A monadic operator that denies a statement or proposition.

Tautology

A statement form that is always true regardless of the truth values of its components.

Indirect Proof

A deductive proof method that starts by denying the conclusion.

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Universal Quantifier

Symbolized as (X), indicates a statement that applies to all elements in a domain.

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Predicate Logic

Involves propositions that express attributes or properties of subjects.

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Syllogism

A logical argument with two premises leading to a conclusion, having exactly three terms.

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Hypothesis

A tentative solution to a problem, essential in scientific investigation.

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Study Notes

Chapter 1: Decision Procedure

  • STTM is an indirect method
  • Negation is a monadic operator
  • Contradiction is always false
  • A tautology is a statement form that is always true
  • STTM is a decision procedure based on the reductio-ad-absurdum method

Chapter 2: Deductive Proof

  • Indirect proof methods begin by denying the conclusion
  • Rules of inference apply only to whole statements
  • In conditional proof, the antecedent of the conclusion is assumed
  • Indirect proof is a deductive proof method based on the reductio-ad-absurdum method

Chapter 3: Predicate Logic

  • A singular proposition states whether an individual possesses a property
  • General propositions assert something about classes
  • Propositional functions are neither true nor false
  • Predicate constants represent specific properties
  • (Χ) is the universal quantifier
  • "Given anything" is an example of a universal quantifier
  • Variables not part of a quantifier, without a quantifier, are called free variables.
  • "There is at least one x" is an existential quantifier

Chapter 4: Traditional Logic

  • Aristotle founded traditional logic
  • A term is distributed when it refers to the entire class
  • In traditional logic, singular propositions are considered universal
  • There is a subalternation relationship between A and I propositions
  • A disjunctive proposition states alternatives in traditional logic.
  • In E propositions, both terms are distributed
  • A valid syllogism's premises imply its conclusion
  • The premise with the predicate term is the major premise
  • Syllogisms have three terms
  • An argument involving propositions is called a sorites argument

Chapter 5: Induction

  • Observation and experiments are other material grounds for induction.
  • Repetition is possible in experiments
  • The misinterpretation of facts in observations is the fallacy of mal observation.
  • Experiment variation is possible.
  • Causation is a formal basis for induction
  • Hypotheses are tentative solutions to problems
  • Simple hypotheses make minimal assumptions
  • Hypotheses are significant in scientific investigation
  • Insight is one origin of hypotheses

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