Re: What's going on here??

• To: mathgroup at smc.vnet.net
• Subject: [mg33528] Re: What's going on here??
• From: "Allan Hayes" <hay at haystack.demon.co.uk>
• Date: Fri, 29 Mar 2002 06:13:10 -0500 (EST)
• References: <a7jt5j\$frm\$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```Mat,
More odd behaviour

Simplify[5(b*a - (b + 1)*a + a) == 0, {a>0}]

False

Simplify[(b*a - (b + 1)*a + a) == 0, {a>0}]

True

Simplify[5*(b*a - (b + 1)*a + a) == 0, {a>5,b>5}]

True

Simplify[5(a+a b-a(1+b))==0]

True

I don't have an explanation.

--
Allan

---------------------
Allan Hayes
Mathematica Training and Consulting
Leicester UK
www.haystack.demon.co.uk
hay at haystack.demon.co.uk
Voice: +44 (0)116 271 4198
Fax: +44 (0)870 164 0565

"Mat Bowen" <m.k.bowen at lboro.ac.uk> wrote in message
news:a7jt5j\$frm\$1 at smc.vnet.net...
> Hello,
>
> I was getting weird results today and reduced the code producing them to
> this:
>
> Clear[a,b,c]
> Simplify[5(a+a b-a(1+b))==0,{c>5}]
>
> False
>
>
> Surely that¹s not right?! Can anyone explain whats going on?
>
> Thanks, and apologies if this is already known.
>
> Mat Bowen
> Department of Mathematics
> Loughborough University
>
>

```

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