From mboxrd@z Thu Jan 1 00:00:00 1970 To: 9fans@cse.psu.edu From: "Thomas Bushnell, BSG" Message-ID: <877kpzolnv.fsf@becket.becket.net> Content-Type: text/plain; charset=us-ascii References: <3C57AF73.727F8CE9@null.net>, <15447.54321.120322.757656@nanonic.hilbert.space> Subject: Re: [OT] Re: [9fans] Getting started in Plan9 - help Date: Wed, 30 Jan 2002 16:25:33 +0000 Topicbox-Message-UUID: 495f5368-eaca-11e9-9e20-41e7f4b1d025 paurea@gsyc.escet.urjc.es writes: > Well, as everything, depends on what you call type. Everything here > are Tensors at least. (and also vectors, because tensor spaces are > vector spaces). Two tensors are of the same type if they have the same formal character: that is, the same rank (and, if you are allowing covectors, then the same rank and the same indexes "up" and "down"). > Anyway I think you confusing the c.p. with the wedge product which is > it's dual in an special case. As far as I know the c.p. of two vectors > is a vector. Only in three dimensions.