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*To*: <david.marjanovic@gmx.at>, "The Dinosaur Mailing List" <dinosaur@usc.edu>*Subject*: Re: [Re: Feathered/scaly theropods: trying to make the point.]*From*: "philidor11" <philidor11@snet.net>*Date*: Sun, 24 Jun 2001 10:41:49 -0400*References*: <20010623215439.7605.qmail@nw179.netaddress.usa.net> <006b01c0fc99$728b46e0$b4432fd5@telekabel.at>*Reply-to*: philidor11@snet.net*Sender*: owner-dinosaur@usc.edu

<Jura - who believes all dinosaurs are scaly, until proven otherwise.> To which you responded: <It _is_ proven otherwise (not a mathematical proof, but a juridical proof).> Rather than juridical, relating to the law, I suggest magisterial, which means authoritative. A mathematical proof is true using mathematical logic. A legal proof is true using legal logic. Ascribing stubble/feathers to dinos not shown to have them is true using a cladistic logic. In all 3 cases, the result is based not on observation, but self-consistency. The difference is that where math (I think) and legality each have a single, accepted logic, cladistics has multiple logics based on different principles (pure parsimony being just one alternative). In addition, some mathematical logical arguments and many cladistic arguments are subject to eventual refutation by new observations. In both, it is possible to draw conclusions which are proven wrong. That an argument is logical does not make it correct. So, a cladistic argument relies to an extent on the credibility, the acceptance of the choices made by the person(s) making the argument. Magisterial communicates that aspect of argument from authority.

**References**:**Re: [Re: Feathered/scaly theropods: trying to make the point.]***From:*archosaur@usa.net

**Re: [Re: Feathered/scaly theropods: trying to make the point.]***From:*"David Marjanovic" <david.marjanovic@gmx.at>

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