What does domF mean in mathematics? Dom = domain, pre-domain, set theory term.

Example:

Let f be a binary relationship from a to b, from

For example, let A = {1, 2,3,5}, B = {1, 2,4}, and the relation f on AxB is defined as: R = {( 1, 2) (1, 4) (2.

DomF={ 1，2，3}。

What does the symbol e mean in mathematics? In mathematics, e stands for natural constant, and values similar to π are irrational numbers.

The equation equal to e is

e= 1+ 1/( 1！ )+ 1/(2! )+ 1/(3! )+ 1/(4! )+...+ 1/(n！ )+... (the result of adding infinitely many items)

Where n! = 1*2*3*4*...*(n- 1)*n。

In mathematics: what does sin mean to find sine?

formulas of trigonometric functions

Sine: The opposite side of angle α is higher than the hypotenuse.

Cosine (cos): The adjacent side of angle α is the upper hypotenuse.

Tangent (tan): The opposite side of angle α is greater than the adjacent side.

Cotangent: The adjacent side of angle α is higher than the opposite side.

Secant: the hypotenuse of angle α is larger than the adjacent side.

Cotangent: The hypotenuse of angle α is higher than the edge.

Mathematically, exponential explosion refers to exponential explosion, which means that the exponential function will explode when certain conditions are met.

Exponential function,

F (x) = a x (a is a constant),

When a > 1, with the increase of x, the growth of f(x) will obviously accelerate.

Especially when a ≥ 2, when x increases to a certain extent, the function f(x) will explode.

What does Sina mean in mathematics? Sin refers to sine, that is, the ratio of the opposite side of angle A to the hypotenuse.

If () in help-seeking mathematics refers to what stock index futures IF is, where IF is the abbreviation of futures contract, IF refers to futures with the Shanghai and Shenzhen 300 Index as the contract target, and 03 refers to the delivery month of futures contract, which refers to March 2008. At present, there are four contracts in the Shanghai and Shenzhen 300 futures trading, which are the current month, the next month and the next two quarters, so the currently traded IF1,IF 12, IF03 and IF06 represent 20071and 2007 65438 respectively.

In mathematics, e = 2.718 ... What does "e" mean? E is a natural constant, about 2.718281828459045235360287471352662497757 ... This is an irrational number.

The natural constant is the limit of the sequence an = (1+ 1/n) n when n tends to positive infinity, and the logarithm based on this number is called the natural logarithm. Natural logarithm is widely used in mathematics because it has better analytical properties than other logarithm with base.

What is the reciprocal in mathematics? The product of two real numbers is 1, so these two numbers are reciprocal. For example, the following sets of numbers are reciprocal:

The numerator and denominator are also interchangeable: the reciprocal of 5/3 is 3/5.

3 and 1/3 5/3 and 3/5 -0.5 and -2.

In addition, the reciprocal of 1 and-1 is itself, because zero cannot be divisible, so zero has no reciprocal.

In addition, there is a saying of "negative reciprocal", that is, two numbers whose product is negative 1 are mutually "negative reciprocal".

Formally, the reciprocal of a fraction is exactly the reciprocal of its numerator denominator.

Essentially, the product of two reciprocal numbers is 1.

What does "complete quotient" mean in mathematics? A ÷ b = c, and b is not zero. When the number A is divided by the number B (not 0), it is called a complete quotient. For example, 9 ÷ 3 = 3, and 3 is the complete quotient.