Flashcards in appendix Deck (11):

1

## a is an element of set A

### a ∈ A

2

## a ∈ A

### a is an element of set A

3

## A ⇒ B

### material implication: True only in the case that either A is false or B is true.

4

## material implication: .. implies; if .. then..

###
A ⇒ B

or

A → B

or

A ⊃ B

5

## A ⇒ B

### material implication: .. implies; if .. then..

6

## A → B

### material implication: .. implies; if .. then..

7

## A ⊃ B

### material implication: .. implies; if .. then.. / superset

8

## material equivalence: ... if and only if; iff; means the same as

###
A ⇔ B

or

A ≡ B

or

A ↔ B

9

## A ⇔ B

### material equivalence: ... if and only if; iff; means the same as

10

## A ≡ B

### material equivalence: ... if and only if; iff; means the same as

11