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Re: Cannot solve very simple equation.

• To: mathgroup at smc.vnet.net
• Subject: [mg105725] Re: Cannot solve very simple equation.
• From: Alois Steindl <Alois.Steindl at tuwien.ac.at>
• Date: Wed, 16 Dec 2009 06:34:59 -0500 (EST)
• References: <hgaftl$qba$1@smc.vnet.net>

negatron <lokieffect at gmail.com> writes:

> NSolve[x^2 + 1 == 2^x]
>
> "Solve::tdep: "\!\(\*
> StyleBox[\"\\\"The equations appear to involve the variables to be
> solved for in an essentially non-algebraic way.\\\"\", \"MT\"]\) ""
>
> Am I forgetting something trivial here?
>
Hello,
from the Help page:
	NSolve[lhs==rhs,var]
gives a list of numerical approximations to the roots of a polynomial equation. 

Although your equation looks quite simple, it isn't polynomial.

Alois


-- 
Alois Steindl,                           Tel.: +43 (1) 58801 / 32558      
Inst. for Mechanics and Mechatronics     Fax.: +43 (1) 58801 / 32598
Vienna University of Technology,         A-1040 Wiedner Hauptstr. 8-10   

• Follow-Ups:
  • Re: Re: Cannot solve very simple equation.
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>