# Challenge B Introductory Logic Intro,Unit 1 Canada

### 16 terms by bigmacbrothers

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Introductory Logic by Nance and Wilson

### logic

the science and art of reasoning well

### law of excluded middle

any statement is either true or false

### law of identity

if a statement is true, then it is true

a statement cannot be both true and false

### formal logic

deals directly with the proper modes of reasoning

### Informal Logic

deals with operations of thinking that are indirectly related to reasoning

### induction

reasoning with probability from examples or experience to general rules

### deduction

the reasoning with certainty from premises to conclusions

### term

a concept that can be expressed precisely

### Definition

a statement that gives the meaning of a term

### ambiguous

a word is ambiguous if it has more than one possible meaning

### Vague word

is one whose extent is unclear

### genus of a term

is a term that is more general, broad, or abstract than the original term and includes it

### species of a term

is a term that is more specific, narrow, or concrete than the original term and is included by it.

### extension of a term

the sum of all the individual objects described by it

### intension of a term

is the sum of all common attributes denoted by the term

Example: