Revision Symbols Flashcards
A ⊆ B
A is a subset of B
A ⊂ B
A is a proper subset of B
A ∩ B = Ø
A intersection B is disjoint (equal to an empty set)
A ∪ B
A union B
A’
A prime
XxY
X cross Y
(x,y)
ordered pair of x and y,
y ∈ Y
y is an element of capital Y
D(f)
the domain of f
f(x)
f of x
X → Y
(the mapping) from X into Y
a ≠ b
a is not equal to b
R(f)
the range of f
xRy → yRx
if x is in relation to y, then y is in relation to x
xRy ∧ yRz → xRz
if x is related to y and y is related to z, then x is related to z
x-z = (x-y) + (y-z) ∈ Z
x minus z is equal to x minus y in parentheses plus y minus z in parentheses element of (capital)Z
x ≈ z
x is approximately equal to z
√9
the square root of 9
a³
a cubed
ax + b = 0
a times x plus b equals zero
x ≤ y
x is less than or equal to y
x~y ↔ x - y ∈ Z
x is equivalent to y if and only if (iff) x minus y is an element of (capital)Z
