![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
Rational set: irrational set: positive real set: real set: As follows:-11, root 5,3, root 9/11,0,2/3, root 196,-π,0.4, root 2/3
Rational number:-11,3,0,2/3, root 196(14),0.4
Irrational number: root number 5, root number 9/11,-π, root number 2/3
Positive real numbers: all but 0,-11,-π are
Real: All are
Real numbers include rational numbers and irrational numbers, where irrational numbers are infinite non-recurring decimals and rational numbers include integers and fractions
Rational:-11,3,0,2/3, root 196(14),0.4
Irrational number: root number 5, root number 9/11,-π, root number 2/3
Positive real numbers: all but 0,-11,-π are
Real number: all are
Real numbers include rational numbers and irrational numbers, where irrational numbers are infinite non-recurring decimals and rational numbers include integers and fractions
Classified rational number of real number {real number {irrational number}
Real: Rational: Integer: positive,0, negative
Scores: positive, negative
Irrational number: positive irrational number, negative irrational number
ON THE UNDERSTANDING PROBLEM OF LOCAL NORMALITY OF FUNCTION LIMIT Taking A/2 in the definition proof only means that a number is found in the domain to make f (x)>0, that is, there is f (x)>0 in the domain. It can not be proved that f (x) is always greater than 0 in the domain. If it's not Heng greater or Heng less, how can we keep it? And when A =0, there's no guarantee? ON THE UNDERSTANDING PROBLEM OF LOCAL NORMALITY OF FUNCTION LIMIT A/2 in the definition proof only means that a number is found in the domain to make f (x)>0, that is, there is f (x)>0 in the domain. If it's not bigger and smaller, how can it be guaranteed? And when A =0, there's no guarantee? ON THE UNDERSTANDING PROBLEM OF LOCAL SIGNAL PROTECTION OF FUNCTIONAL LIMIT Taking A/2 in the definition proof only means that a number is found in the domain to make f (x)>0, that is, there is f (x)>0 in the domain. If it's not Heng greater or Heng less, how can it be guaranteed? And when A =0, there's no guarantee?
It's not like that.
See proof of insurability first:
First there is the function f (x) at x→x0(note: x0 can be a concrete number or infinite), there is a limit A >0(A0, there is δ>0, so that |x-x0|
It's not like that.
First see the proof of warranty:
First, when the function f (x) is x→x0(note: x0 can be a concrete number or infinite), there is a limit A >0(A0, there is δ>0, so that |x-x0|
Understanding of Limit Warranty I don't know what's going on, Understanding of Limit Protection He really didn't know what was going on,
Did you get it right?
Guaranteed, that is:
If x→a, f (x)→A,
If A >0
Then in some neighborhood N (a) of a, in this neighborhood f (x)>0,
This neighborhood can be very small, but it must exist
It can also be understood that you can find a point x1 near a so that f (x1)>0
When A <0, follow the above description.
Understanding and Understanding of Limit Algorithm It needs to be recognized and understood in words.
0
Limit Warranty Understanding? Why is it so important? Given the function limit A >0, any ε>0, there exists δ>0, so that |x-x0|<δ, has |f (x)-A |<ε Because ε is arbitrary,ε0=A/2 is taken Then δ>0, so that |x-x0|<δ, has |f (x)-A|<ε0=A/2 I.e. f (x)> A/2>0 What is the final decision for this f (x)> A/2? Must it be f (x)> A/2? Why do I only get 2A/3> f (x)>-A/2 when I go absolute?
I can only say that you are wrong
-A/2A/2
I can only say you're wrong.
-A/2A/2
RELATED INFORMATIONS
- 1. Right-hand spiral law?
- 2. Maths Senior One 》》》 The following lowercase letters are all vectors If the nonzero vector a, b satisfies |a+b|=|b|, then... ( ) (A)|2a|>|2a+b| (B)|2a||a+2b| (D)|2b|
- 3. Do all vectors follow the parallelogram rule? Does the non-collinear force follow the parallelogram rule?
- 4. Verify which is the experimental value and which is the theoretical value in the parallelogram rule of force? Is the resultant force of F1, F2 or the force F of a force?
- 5. What is the law of the center of gravity of an ordinary triangle?
- 6. As shown in the figure, DE is the median line of the triangle ABC, and the median line theorem of the triangle is proved by the vector method
- 7. The vector proves that the three center lines of the triangle intersect at one point, 1. Prove that the three center lines of the triangle intersect at one point (all the following letters represent vectors) Let AC=a, BC=b as substrate AB=a-b, AD=a-(b/2), BE=(-a/2)+b Let AD and BE intersect at G1, and assume that AG1=λAD, BG1=μBE, Then AG1=λa-λb/2, BG=(-μa/2) b Since AG1= AB+BG1=(1-(μ/2)) a =(μ-1) b Therefore, the equation can be solved as follows:λ=μ=2/3, so AG1=2/3AD If AD and CF intersect at point G2, the same method can prove that AG2=2/3AD (How to prove here, do you have to reset the base? I can't solve it with the old base, or I' ve calculated what's wrong. Write down the steps summarized in the last "the same way ". Thank you)
- 8. CONDITIONS OF THREE POINT COLLINEARITY IN SPACE
- 9. What is the general way to prove three-point collinearity Don't use space vectors! Proving the Relation of Point, Line and Surface in Space What methods do we have to prove that three points are collinear Don't use space vectors! Proving the Relation of Point, Line and Surface in Space
- 10. A Proof of Plane Vector ~ Help Me ~ If vector a=(cosα, sinα), vector b=(cosβ, sinβ), then vector a and vector b must satisfy (a+b)⊥(a-b). Why...? Please describe the detailed process and ideas ~ Thank you so much~~! A Proof of Plane Vector If vector a=(cosα, sinα), vector b=(cosβ, sinβ), then vector a and vector b must satisfy (a+b)⊥(a-b). Why...? Please describe the detailed process and ideas ~ Thank you so much~~! A Proof of Plane Vector ~ Help me ~ If vector a=(cosα, sinα), vector b=(cosβ, sinβ), then vector a and vector b must satisfy (a+b)⊥(a-b). Why...? Please describe the detailed process and ideas ~ Thank you so much~~!
- 11. I sold 1,450 yuan this morning, including 200 for shoes and 1,250 for clothes.
- 12. Two date periods are known in C #, For example, good days from December 1,2008 to January 4,2009?
- 13. A Simple Mathematical Calculation 20/9/8/11/9/2X11/8
- 14. Add, subtract, multiply and divide by (2,5,5,9,9) to obtain 95. There can be fractions, decimals.
- 15. How's my math, okay? I was in Rainbow Middle School, September 2014. We formally took the math test 13 times, each time the full score is 120 points, my grades are (unit: points):114,112,116,117,113,117,120,120,108,109,120,120,115. The average grade is usually 80.
- 16. What is the number of e in mathematics? How did you figure it out?
- 17. Commonly used vector formulas for electromagnetic field interpretation Why does this formula have both A gradient and A divergence? I think only scalar can find gradient, only vector can find divergence. So why can this A be found?
- 18. Take a certain direction as the positive direction. If F=-5N, it indicates that the force is 5 N, and the direction is opposite to the positive direction. If F=5N, it indicates that the force is 5 N, and the direction is the same as the positive direction; or only the force is 5 N, and the direction is unknown. If F=5N, how to distinguish the two cases! Judge the right and wrong of the phrase "sometimes the direction of a vector is represented by a positive and negative sign, the purpose of which is to simplify vector operations on the same line into algebraic operations "!
- 19. Let the eigenvalue of the third-order real symmetric matrix A be -1,1,1. Let the eigenvector X=(-1,1,1) corresponding to the eigenvalue -1, find A
- 20. Linear algebra: Let λ1=-1,λ2=λ3=1 be the eigenvalue of the real symmetric matrix A of third order, and let p1={0,1,1} be the eigenvector of λ1=-1 for A. The eigenvector of A belonging to eigenvalue λ2=λ3=1 is obtained, and the symmetry matrix A is obtained. Let the eigenvectors x={ x1, x2, x3} be transposed. That's why. One of the solutions is p2={1,0,0} transpose p2={0,1,-1} transpose. Why not let p2={1,1,1} transpose? Is it linear? How to judge the correlation if it is two vectors? I only know three vectors...