Revision Symbols

Question 1

A ⊆ B

Answer 1

A is a subset of B

Question 2

A ⊂ B

Answer 2

A is a proper subset of B

Question 3

A ∩ B = Ø

Answer 3

A intersection B is disjoint (equal to an empty set)

Question 4

A ∪ B

Answer 4

A union B

Question 5

A’

Answer 5

A prime

Question 6

XxY

Answer 6

X cross Y

Question 7

(x,y)

Answer 7

ordered pair of x and y,

Question 8

y ∈ Y

Answer 8

y is an element of capital Y

Question 9

D(f)

Answer 9

the domain of f

Question 10

f(x)

Answer 10

f of x

Question 11

X → Y

Answer 11

(the mapping) from X into Y

Question 12

a ≠ b

Answer 12

a is not equal to b

Question 13

R(f)

Answer 13

the range of f

Question 14

xRy → yRx

Answer 14

if x is in relation to y, then y is in relation to x

Question 15

xRy ∧ yRz → xRz

Answer 15

if x is related to y and y is related to z, then x is related to z

Question 16

x-z = (x-y) + (y-z) ∈ Z

Answer 16

x minus z is equal to x minus y in parentheses plus y minus z in parentheses element of (capital)Z

Question 17

x ≈ z

Answer 17

x is approximately equal to z

Question 18

√9

Answer 18

the square root of 9

Question 19

a³

Answer 19

a cubed

Question 20

ax + b = 0

Answer 20

a times x plus b equals zero

Question 21

x ≤ y

Answer 21

x is less than or equal to y

Question 22

x~y ↔ x - y ∈ Z

Answer 22

x is equivalent to y if and only if (iff) x minus y is an element of (capital)Z