Logical reasoning in Discrete Mathematics: A, B, a → B, B Λ, C → D, D → q? The title is: The following facts are known: A. B, a → B, B Λ, C → D, D → Q, prove that Q is true My question is: What do you mean by "" in the title? 2. The proof given in the book is: A,A→C=>C B,C=>B∧C B∧C,B∧C→D=>D D,D→Q=>Q So q is true Prove that I can't understand it, here appears again, what does it mean? Please explain, thank you very much!

Logical reasoning in Discrete Mathematics: A, B, a → B, B Λ, C → D, D → q? The title is: The following facts are known: A. B, a → B, B Λ, C → D, D → Q, prove that Q is true My question is: What do you mean by "" in the title? 2. The proof given in the book is: A,A→C=>C B,C=>B∧C B∧C,B∧C→D=>D D,D→Q=>Q So q is true Prove that I can't understand it, here appears again, what does it mean? Please explain, thank you very much!

If it is a, B, a → C, B Λ, C → D, D → Q, the explanation will work. A is true, because a deduces C, so C is true, B is true, C is true, B and C are true, B and C are true, because B and C are true, so D is true, because D is true, D deduces Q, so q is true

Is to prove that for any element a, B, C, D, there are
（a∧b）∨（c∧d）≤（a∨c）∧（b∨d）

It is proved that a ∧ B is the maximum lower bound of a, B, and a ∨ C is the minimum upper bound of a, C, so a ∧ B ≤ a ∨ C is obtained. Then a ∧ B ≤ a ∨ C is obtained from the transitivity of relation ≤ because C ∧ D is the maximum lower bound of C, D, and a ∨ C is the minimum upper bound of a, C, so C ∧ D ≤ C, C ≤ a ∨ C is obtained

Let r = {,,} on the set a = {a, B, C, D}, find R &; R-1
For example, find R &; R-1
Thank you very much

It should be a composite operation, and then remove the reflexivity
Only with the synthesis, get;
They were synthesized with, respectively,;
There is no synthetic relationship,
The method is simple and convenient;
There is no reflexive relation in all the relations, and the final result is {,,}

If a / / B, B / / C, then_______ According to_____________________________ -

If a / / B, B / / C, then___ a∥c____ According to___________ Two lines parallel to the same line are parallel to each other__________________ -

Junior high school mathematics calculation formula (such as a + b * A-B =?)
To calculate the formula, don't write so much

This is the inverse operation of the square difference formula, which belongs to the factorization part
a^2-b^2=(a+b)(a-b)
There are three formulas for Factorization in junior high school
Square difference formula: A ^ 2-B ^ 2 = (a + b) (a-b)
Complete square formula: (a + b) ^ 2 = a ^ 2 + B ^ 2 + 2Ab
（a-b)^2=a^2+b^2-2ab
Multiplication with cross: x ^ 2 + (P + Q) x + PQ = (x + P) (x + Q)

Junior high school mathematics (a + B + C) ^ 2 = what?

(a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ac.

As shown in the figure, in △ ABC, ∠ B = 50 °, C = 70 °, ad is the height, AE is the angle bisector, and the degree of ∠ ead is calculated

∫ B = 50 °, C = 70 °, ∫ BAC = 180 ° - B - ∠ C = 180 ° - 50 ° - 70 ° = 60 °, ∫ AE is angular bisector, ∫ BAE = 12 ∠ BAC = 12 × 60 ° = 30 °, ∫ ad is high, ∫ bad = 90 ° - B = 90 ° - 50 ° = 40 °, ∫ ead = ∫ BAE - ∠ bad = 40 ° - 30 ° = 10 °

Given | A-B | = | B-C | = 1, find the value of | A-D |

It should be: | A-B | = | B-D | = 1
|a-d|=|a-b+b-d|=|a-b|+|b-d|=1+1=2

A + B = 3, C-B = - 2, find the value of (2a-3b + C) - 3 (a-b)

(2a-3b + C) - 3 (a-b) = 2a-3b + c-3a + 3B = c-a. it is known that a + B = 3, C-B = - 2, so a + C = 1

How much is A.B.C for a mathematical problem?
A. B. C is three different prime numbers. If the square or cube of a is B + C = 43, then a = b = C=

There is something wrong with this question. Is it wrong?