Cambridge International AS and A Level 数学符号你知道几个？

Cambridge International AS and A Level Mathematics
Mathematical notation
Examinations for CIE syllabuses may use relevant notation from the following list.
1 Set notation
is an element of
is not an element of
{x1, x2, …} the set with elements x1, x2, …
{x : …} the set of all x such that …
n(A) the number of elements in set A
the empty set
the universal set
, the universal set (for 0607 IGCSE International Mathematics)
A′ the complement of the set A
the set of natural numbers, {1, 2, 3, …}
the set of integers, {0, ±1, ±2, ±3, …}
the set of rational numbers,
the set of real numbers
the set of complex numbers
(x, y) the ordered pair x, y
is a subset of
is a proper subset of
union
intersection
[a, b] the closed interval {x : a x b}
[a, b) the interval {x : a x < b}
(a, b] the interval {x : a < x b}
(a, b) the open interval {x : a < x < b}
(S, ) the group consisting of the set S with binary operation
2 Miscellaneous symbols
= is equal to
≠ is not equal to
≡ is identical to or is congruent to
≈ is approximately equal to
~ is distributed as
is isomorphic to
is proportional to
< is less than
is less than or equal to
> is greater than
is greater than or equal to
∞ infinity
implies
is implied by
implies and is implied by (is equivalent to)

2020年10月11日 19:00