Closed+conic
51Cupressus goveniana — Conservation status Vulnerable ( …
52Cupressus guadalupensis — Conservation status Vulnerable&# …
53Cupressus lusitanica — A mature Cupressus lusitanica Conservation status …
54Logic and the philosophy of mathematics in the nineteenth century — John Stillwell INTRODUCTION In its history of over two thousand years, mathematics has seldom been disturbed by philosophical disputes. Ever since Plato, who is said to have put the slogan ‘Let no one who is not a geometer enter here’ over the… …
55Algebraic geometry — This Togliatti surface is an algebraic surface of degree five. Algebraic geometry is a branch of mathematics which combines techniques of abstract algebra, especially commutative algebra, with the language and the problems of geometry. It… …
56Line at infinity — Ideal line redirects here. For the ideal line in racing, see Racing line. In geometry and topology, the line at infinity is a line which is added to the real (affine) plane in order to give closure to, and remove the exceptional cases from, the… …
57Conifer cone — Mature female Lodgepole Pine cone An Aleppo Pine cone ( …
58Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity. Computer scientist Manindra Agrawal of the… …
59Euclidean geometry — A Greek mathematician performing a geometric construction with a compass, from The School of Athens by Raphael. Euclidean geometry is a mathematical system attributed to the Alexandrian Greek mathematician Euclid, which he described in his… …
60Coast Douglas-fir — Taxobox name = Coast Douglas fir status = LR/lc | status system = IUCN2.3 image width = 240px image caption = Coast Douglas fir foliage regnum = Plantae divisio = Pinophyta classis = Pinopsida ordo = Pinales familia = Pinaceae genus = Pseudotsuga …
