Re: hierarchical [WAS: Time Lords and Sea Lords]

On Apr 16, 1:48 am, "Richard Maurer" <rcpb1_mau...@xxxxxxxxx> wrote:
Richard Maurer wrote:

A "mathematicaltree" is commonly seen in the
computer science branch of mathematics. A relevant
example is the business organization chart, with lines
leading down to subordinates. (A schematic of the roots
of atree, smaller roots below big roots.)

Interestingly, the nomenclature of trees (branches,
leaf nodes) indicate that trees were originally drawn
getting larger upwards. I only remember seeing them
with the leaf nodes at the bottom; the earliest books
I saw were probably written in the 1960s. Does anyone
know in what decades it was common to draw trees upwards?

I sent a comment of this yesterday, but itr seems to have disappeared
into the void, so I'll try again.

I don't know the answer to your specific question, but biologists have
long drawn evolutionary trees any way they feel like. In the 19th
century Ernst Haeckel drew his famous tree of life with the root at
the bottom, and Darwin drew the only illustration that he put in The
Origin of Species in the same way. In modern times the root is more
often, but by no means always, at the top or the left (convenient for
huge numbers of branches). Trees with the root at the right are not
common, but can be convenient if you want to compare classifications
by two different methods of the same data, because you can have two
trees side by side, with a left-rooted one on the left and a right-
rooted one on the right. Trees that rival Haeckel in trying to relate
plants, animals, fungi, protista, eubacteria and archaea in one
massive tree going all the way back to the LUCA (last universal common
ancestor) sometimes put the root in the middle with the modern
descendants around the circumference.

athel


.

Relevant Pages

  • >>>> ROOT TREES <<<<
    ... Bare Root Dwarf Fruit Trees ... Japanese Maple Trees Root System ...
    (sci.logic)
  • Re: (sketch of a) Proof that the set of Real Numbers doesnt exist
    ... while in set-theory "structure-preserving isomorphism" was explicitely ... >>about the vocabulary on trees. ... declare one node of the tree to be the root. ... one neighbours, and that a single node which I chose to call root ...
    (sci.math)
  • =?ISO-8859-1?Q?Re=3A_AS_geb=FAr=3B_bauer=3B_neighbour?=
    ... the root is restricted to Gmc. ... n., etc., find a common meaning "room, single building", and tell ... many other feminine plurals of neuters.) ... Because disturbing details have to be explained. ...
    (sci.lang)
  • =?ISO-8859-1?Q?Re=3A_AS_geb=FAr=3B_bauer=3B_neighbour?=
    ... the root is restricted to Gmc. ... n., etc., find a common meaning "room, single building", and tell ... many other feminine plurals of neuters.) ... Because disturbing details have to be explained. ...
    (sci.lang)
  • Re: AS =?UTF-8?B?Z2Viw7pyOyBiYXVlcjsgbmVpZ2hib3Vy?=
    ... seljak have in common? ... village', which is cognate with OIc 'room, hall'. ... but does reduce the possiblity of the existence of any previous root having been common to all three on independent tracks. ... can I presume a meaning of 'high town' in Old Swedish? ...
    (sci.lang)
Loading