9 Answered Questions for the topic Math Proof Help

12/08/18

#### How do I prove this statement using the axioms of integer arithmetic: If a < 0, b > 0, then ab < 0?

Math Proof Help

06/09/18

#### Given line AP and AS are tangent to point O at P and S respectively. Prove line segment AO is perpendicular to line segment PS

How to solve geometry proof when determining two segments are perpendicular.

02/13/18

#### Simplify using logic of laws, Question "~(~b∧a)∧(b∨a) "

~ mean not
^ mean and
∨ mean or
Help me pls

02/12/18

#### Prove by Induction question, 2+6+18+...+ 2.3^n-1 = (3^n)-1

Can anyone help me solving this problem, Im really really lost. Thank you

02/12/18

#### Contradiction prove question, "Prove by contradiction that the difference between any odd integer and any even integer is odd"

How to do this, please help me. Thank you very much!

02/12/18

#### Direct proof question, "The product of an even integer and an odd integer is even".

I didnt understand
Let say X = 2a +1 while y = 2b+1
Why you need to multiply xy rather x+y, as you can see below:
XY = (2a+1)(2y+1) <- correct
X+Y = 2a+1+2y+1 <- Incorrect
Can you...
more

01/30/18

#### Prove that sup(a, b)=sup[a, b]=b and inf(a, b)=inf[a, b]=a. Is completeness relevant?

Denoting, as usual, by (a, b) an ”open interval”, {x : a<x< b} and by [a, b] the corresponding ”closed interval”, {x : a≤x≤b} of real numbers, prove that sup(a, b)=sup[a, b]=b and inf(a,...
more

#### Set Theory/Math Logic

Is there any way to prove that
- Every point in A intersect B is greater than or
equal to 1?
- The intersection of two sets has a point in commonwith another set?
If there is no way to...
more

Math Proof Help

10/20/17

#### prove that x and y are even if 5x + y = 8

I have to prove that x and y are even if 5x + y = 8

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