Log[4]==2*Log[2]

*To*: mathgroup at smc.vnet.net*Subject*: [mg50520] Log[4]==2*Log[2]*From*: Andreas Stahel <sha at hta-bi.bfh.ch>*Date*: Thu, 9 Sep 2004 05:17:32 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

To whom it may concern the following answer of Mathematica 5.0 puzzeled me Log[4]==2*Log[2] leads to N::meprec: Internal precision limit $MaxExtraPrecision = 50.` reached while \ evaluating -2\Log[2]+Log[4] with the inputs given as answer. But the input Log[4.0]==2*Log[2] leads to a sound "True" Simplify[Log[4]-2*Log[2]] leads to the correct 0, but Simplify[Log[4]-2*Log[2]==0] yields no result There must be some systematic behind thid surprising behaviour. Could somebody give me a hint please With best regards Andreas -- Andreas Stahel E-Mail: Andreas.Stahel at [ANTI-SPAM]hti.bfh.ch Mathematics, HTI Phone: ++41 +32 32 16 258 Quellgasse 21 Fax: ++41 +32 321 500 CH-2501 Biel WWW: www.hta-bi.bfh.ch/~sha Switzerland

**Follow-Ups**:**Re: Log[4]==2*Log[2]***From:*Andrzej Kozlowski <andrzej@akikoz.net>