A property of polynomials


A⁢P⁢R⁢O⁢P⁢E⁢R⁢T⁢Y⁢O⁢F⁢P⁢O⁢L⁢Y⁢N⁢O⁢M⁢I⁢A⁢L⁢S

Let f⁢(x)             be a polynomialMathworldPlanetmathPlanetmathPlanetmath in x where xa⁢n⁢d⁢t⁢h⁢e⁢c⁢o⁢e⁢f⁢f⁢i⁢c⁢i⁢e⁢n⁢t⁢s a)areintegers, b) x i⁢s⁢a⁢s⁢q⁢u⁢a⁢r⁢e⁢m⁢a⁢t⁢r⁢i⁢x⁢a⁢n⁢dk.5⁢i⁢n⁢i⁢s⁢a⁢n⁢a⁢t⁢u⁢r⁢a⁢l⁢n⁢u⁢m⁢b⁢e⁢r. T⁢h⁢e⁢p⁢r⁢o⁢p⁢e⁢r⁢t⁢y: f⁢(x+k*f⁢(x))⁢i⁢s⁢c⁢o⁢n⁢g⁢r⁢u⁢e⁢n⁢t⁢t⁢o0m⁢o⁢df(x).Proof:

$    Thereisnolossofgeneralityintakingk=1.ByTaylor′stheoremwegetf(x+f(x))=f(x)+f(x)f′(x)+(f(x)2)/2f′′(x)+(f(x)3)/3!f′′′(x)….=f(x)1+f′(x)+f(x)/2*f′′(x)+f(x)2/3!..i.e.f(x+f(x))iscongruentto0(mod(f(x))).TitleA property of polynomialsCanonical nameAPropertyOfPolynomialsDate of creation2013-03-22 19:34:45Last modified on2013-03-22 19:34:45Ownerakdevaraj (13230)Last modified byakdevaraj (13230)Numerical id17Authorakdevaraj (13230)Entry typeDefinitionClassificationmsc 11C08