Irreducible Polynomial (or not?)

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The discussion focuses on determining the irreducibility of the polynomial of the form x^n + A1x^(n-1) + A2x^(n-2) + ... + A2x^2 + A1x + 1, where An is a non-zero integer and n is even. Participants clarify that A1, A2, etc., are integers, specifically natural numbers, and emphasize the need to specify the field over which irreducibility is being assessed, particularly over the rational numbers. The conversation highlights the importance of understanding polynomial irreducibility in the context of rational coefficients.

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danieldf
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The polynomial is x^n + A1x^(n-1) + A2x^(n-2) + ... + A2x^2 + A1x + 1. Where An (integer) is not zero for all n and n is even. For example: x²+x+1; x^4+2x^3+3x^2+2x+1.
I'm looking for a method to say if that kind of polynomial is irreducible over racionals... Or when it is.

Thx!
 
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Are A1, A2,... integers? Also, when you say irreducible, you have to specify irreducible over what. No polynomial with integer coefficients is irreducible over the complex numbers, but might be irreducible over, say, the reals or the rational numbers.

Petek
 
Oh really.. Sorry, i just forgot that.
They're integers (naturals in fact)
And i mean irreducible over rationals.

Thx!
 

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