# Thread: Proof of a Conjecture or Counter Examples

1. ## Proof of a Conjecture or Counter Examples

{P-Q}{P^(n-1) + K1[P^(n-2)]Q + K2[P^(n-3)]Q^2 + ....+ Q^(n-1)} cannot equal C^n - B^n
where all the variables are positive integers, n>2, P>Q, C>B
unless all the Ks are equal to 1 or in some instances the Ks have the same value.

2. ## Re: Proof of a Conjecture or Counter Examples

Can anyone please prove or disprove this?

3. ## Re: Proof of a Conjecture or Counter Examples

Please can I have another counterexample, if any, because this one kind off eliminates Q by setting it equal to 1. So an additional constraint of Q > 1.

-Dan

5. ## Re: Proof of a Conjecture or Counter Examples

Originally Posted by topsquark

-Dan
Can i ask why my post was deleted? It was a completely legitimate post providing a proper counterexample.

PS: I have another counterexample with the new constraint given, but if someone is deleting links for no reason, there is no reason to post it.

EDIT:
Forget my above comments. It is just the TS created 2 exact topics and i answered to the other:
Proof of a Conjecture or Counter Examples

7. ## Re: Proof of a Conjecture or Counter Examples

First, take a look at the example in the other thread and see if you can come up with another one based on ChessTal's method.

This is why we don't double post....

-Dan

8. ## Re: Proof of a Conjecture or Counter Examples

Originally Posted by MrAwojobi
For:
P=3
Q=2
n=3
K1=83
C=8
B=1 we have:

$(P - Q) \cdot \left( {{P^{n - 1}} + {K_1} \cdot {P^{n - 2}} \cdot {Q^1} + {K_2} \cdot {P^{n - 3}} \cdot {Q^2} + ... + {K_{n - 2}} \cdot {P^1} \cdot {Q^{n - 2}} + {K_{n - 1}} \cdot {Q^{n - 1}}} \right) \ne {C^n} - {B^n} \Leftrightarrow$

$(3 - 2) \cdot ({3^{3 - 1}} + 83 \cdot {3^{3 - 2}} \cdot {2^1} + {2^{3 - 1}}) \ne {8^3} - {1^3} \Leftrightarrow$

$9 + 498 + 4 \ne 511 \Leftrightarrow$

$511 \ne 511$

9. ## Re: Proof of a Conjecture or Counter Examples

Many thanks for these counterexamples. However can I impose one last constraint i.e. (P-Q) > 1

10. ## Re: Proof of a Conjecture or Counter Examples

Originally Posted by MrAwojobi
Many thanks for these counterexamples. However can I impose one last constraint i.e. (P-Q) > 1
Hmm i guess it would be easy to find another counterexample but we will see.

Thanks.

12. ## Re: Proof of a Conjecture or Counter Examples

Well another one is:
P=4
Q=2
n=3
K1=43
C=9
B=1

13. ## Re: Proof of a Conjecture or Counter Examples

Thank you again. Please don't get tired of me yet but I promise this is the last constraint. P and Q should not share any common factors except the trivial unity.

14. ## Re: Proof of a Conjecture or Counter Examples

Originally Posted by MrAwojobi
Thank you again. Please don't get tired of me yet but I promise this is the last constraint. P and Q should not share any common factors except the trivial unity.
Damn. If a conjecture is wrong, is wrong!!

With the new constraint(LCD(5,2)=1) the conjecture is still wrong:
P=5
Q=2
n=3
K1=352
C=22
B=1

15. ## Re: Proof of a Conjecture or Counter Examples

B>1, C and B don't share a common factor except the trivial unity are the last set of constraints. Sorry I broke my promise.

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