What does c mean? Mathematical circle. The world of mathematics is fascinating and a gathering place for geniuses. Mathematics is a very difficult course for people who are naturally insensitive to mathematics, but we can meet many symbols in mathematics learning. Let's see what C means.
What does c mean? The mathematical circle1c represents the circumference.
In a plane, a closed curve formed by rotating around a point for a certain length is called a circle.
A circle has countless axes of symmetry.
A circle is a conic curve, which is obtained by cutting a cone from a plane parallel to the bottom of the cone.
A circle is a geometric figure. By definition, compasses are usually used to draw circles. The diameter and radius of the inner circle of the same circle are always the same, and the circle has countless radii and diameters. A circle is a figure with axial symmetry and central symmetry. The axis of symmetry is the straight line where the diameter lies. At the same time, the circle is a "positive infinite polygon" and "infinity" is just a concept.
The set of points whose distance from a fixed point on the same plane is equal to a fixed length is called a circle. This fixed point is called the center of the circle.
The length of a circle is the circumference of a circle. Two circles that can overlap are called equal circles.
A circle is not a regular n polygon (n is an infinite positive integer). A positive N-polygon whose side length is infinitely close to 0 but can never be equal to 0 can be approximately equal to a circle, but it is not a circle.
What does c mean? What does mathematical circle 2 c mean in mathematics?
C stands for complex set in mathematics. It is often used in mathematical calculation and other occasions as a symbolic expression of ellipsis in text description.
The set of complex numbers is represented by C, and the set of real numbers is represented by R. Obviously, R is the proper subset of C, and the set of complex numbers is out of order, so the order of size cannot be established. The value of the positive square root of the square sum of the real part and imaginary part of a complex number is called the module of the complex number, which can be written as ∣z∣.
Extended data
Yes. Numbers in the form of z=a+bi are usually called complex numbers, where a is called the real part, b is called the imaginary part, and I is called the imaginary part. When the imaginary part is equal to zero, this complex number can be regarded as a real number; When the imaginary part of z is not equal to zero and the real part is equal to zero, z is often called pure imaginary number. Complex number field is an algebraic closure of real number field, that is, any polynomial with complex coefficients always has roots in complex number field.
Letters representing complex sets:
N in mathematics: nonnegative integer set or natural number set {0, 1, 2, 3, …}
N* or N+: positive integer set {1, 2,3, …}
Z: integer set {…,-1, 0, 1, …}
Q: Rational number set
Q+: Set of Positive Rational Numbers
Q-: set of negative rational numbers
R: set of real numbers (including rational numbers and irrational numbers)
R+: positive real number set
R-: negative real number set
C: complex set
What does c mean? Mathematical circle 3 common mathematical symbols and their meanings.
The sign of (1) quantity: I, 2+i, A, X, natural logarithm base E, pi.
(2) Operation symbols: such as plus sign (+), minus sign (-), multiplication sign (× or), division sign (÷ or/), union of two sets (∩), intersection (∩), root sign (√), logarithm (log, lg, ln.
(3) relational symbols: such as "=" is an equal sign, "≈" is an approximate sign, "≦" is an unequal sign and ">" is a greater than sign. "
(4) Combination symbols: such as parentheses "()" square brackets "[]", and curly braces "{}" enclose the line "-".
(5) Natural symbols: such as positive sign "+",negative sign "-"and absolute value symbol "∨"
(6) Omitting symbols: such as triangle (△), sine (sin), cosine (cos), function of x (f(x)), limit (lim), so (∵), sum (∏) and multiplication (∏). ) and so on.
The meaning of mathematical symbols
symbolic meaning
∞ infinity
π pi
|x| absolute value
Union
intersection
≥ greater than or equal to
≤ less than or equal to
≡ Constant is equal to or congruent with.
Ln(x) logarithm based on e
Lg(x) logarithm based on 10
Integer function on floor (x)
Integer function under ceil(x)
X mod y of remainder
X-floor(x) fractional part
∫f(x)dx indefinite integral
The definite integral of ∫[a:b]f(x)dx a to b
Application of mathematical symbols
If p is true, it is equal to 1, otherwise it is equal to 0.
∑[ 1≤k≤n]f(k) and n can be extended to many situations.
For example, ∑ [n is a prime number] [n
∑∑[ 1≤i≤j≤n]n^2
lim f(x)(x-& gt； ? ) seek the limit
M-order derivative function of f(z) f about z
C(n:m) combination number, where m is taken from n.
P(n:m) permutation number
Divisible by n
M⊥n coprime
A ∈ A a belongs to set A.
# Multiple elements in set A