"Books permit us to voyage through time, to tap the wisdom of our ancestors. The...
The most famous American astronomer and astrophysicist Carl Sagan explains the D...
Explicación dada por Carl Sagan del origen del universo en el capÃtulo 13 de l...
years of photosynthesis on algae and the suchlike, another rather important poin...
and presenting the award-winning 1980 television series "Cosmos: A Personal Voya...
years of photosynthesis on algae and the suchlike, another rather important poin...
Kevin Boyce, HST Systems Engineer, ACS Repair: "Welcome to NASA's spacecraft cha...
will conduct. Some German beer to represent DLR's design and construction of the...
Exploring the most menacing and magnificent features of the cosmos, this remarka...
This is taken from the book. Having him read to you is something else. Enough sa...
Monsters in space: Black holes, wormholes and quasars.Black Holes:
According to Einstein's theory o...
Astronomers have discovered the most Earth-like planet outside our Solar System to date, an exoplane...
In keeping with the theme of TED2008, professor Stephen Hawking asks some Big Questions about our un...
World famous astronomer and astrophysicist, the great Carl Sagan, explains the 4th dimension. Carl E...
Roger Penrose speaks at George Mason University as part of the Aharonov Distinguished Lecture Series...
This is taken from the book. Having him read to you is something else. Enough said.Carl Edward Sagan...
Mathematician Steven Strogatz shows how flocks of creatures (like birds, fireflies and fish) manage ...
Everything you ever wanted to know about the expansion of the universe but were afraid to ask!Until ...
El descubrimiento de Roger Penrose: La singularidad de los agujeros negros.Sir Roger Penrose, OM, FR...
Sagan 4 is a multi-national fictional exobiology art project...
Scott Douglas Sagan is a professor of political science at S...
The Sagan River is a seasonal river in southern Ethiopia. Ri...
Sagan is a town in southern Ethiopia. Located in the Souther...
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Sagan Crater is an impact crater in the Oxia Palus quadrangl...
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Date: (12-01-09) Time: (00:03:31) |
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This is taken from the book. Having him read to you is something else. Enough said.
Carl Edward Sagan (November 9, 1934 – December 20, 1996) was an American astronomer, astrochemist, author, and highly successful popularizer of astronomy, astrophysics and other natural sciences. He pioneered exobiology and promoted the Search for Extra-Terrestrial Intelligence (SETI).
He is world-famous for writing popular science books and for co-writing and presenting the award-winning 1980 television series Cosmos: A Personal Voyage, which has been seen by more than 600 million people in over 60 countries, making it the most widely watched PBS program in history. A book to accompany the program was also published. He also wrote the novel Contact, the basis for the 1997 Robert Zemeckis film of the same name starring Jodie Foster. During his lifetime, Sagan published more than 600 scientific papers and popular articles and was author, co-author, or editor of more than 20 books. In his works, he frequently advocated skeptical inquiry, secular humanism, and the scientific method.
Carl Sagan was born in Brooklyn, New York to a Russian Jewish family. His father, Sam Sagan, was a Russian immigrant garment worker; his mother, Rachel Molly Gruber, was a housewife. Carl was named in honor of Rachel's biological mother, Chaiya Clara, "the mother she never knew", in Sagan's words. Sagan graduated from Rahway High School in Rahway, New Jersey in 1951. He attended the University of Chicago, where he participated in the Ryerson Astronomical Society, received an A.B. with general and special honors (1954), a S.B. (1955) and a S.M. (1956) in physics, before earning a Ph.D. degree (1960) in astronomy and astrophysics. During his time as an undergraduate, Sagan spent some time working in the laboratory of the geneticist H. J. Muller. From 1960 to 1962 he was a Miller Fellow at the University of California, Berkeley. From 1962 to 1968, he worked at the Smithsonian Astrophysical Observatory in Cambridge, Massachusetts.
Sagan lectured annually at Harvard University until 1968, when he moved to Cornell University. He became a full Professor at Cornell in 1971 and directed the Laboratory for Planetary Studies there. From 1972 to 1981 he was Associate Director of the Center for Radio Physics and Space Research at Cornell.
Sagan was a leader in the U.S. space program since its inception. From the 1950s onward, he worked as an adviser to NASA. One of his many duties during his tenure at the space agency included briefing the Apollo astronauts before their flights to the Moon. Sagan contributed to most of the robotic spacecraft missions that explored the solar system, arranging experiments on many of the expeditions. He conceived the idea of adding an unalterable and universal message on spacecraft destined to leave the solar system that could be understood by any extraterrestrial intelligence that might find it. Sagan assembled the first physical message that was sent into space: a gold-anodized plaque, attached to the space probe Pioneer 10, launched in 1972. Pioneer 11, also carrying the plaque, was launched the following year. He continued to refine his designs throughout his lifetime; the most elaborate message he helped to develop and assemble was the Voyager Golden Record that was sent out with the Voyager space probes in 1977.
At Cornell, Sagan taught a course on critical thinking until his death in 1996 from a rare bone marrow disease. The course had only a limited number of seats. Although hundreds of students applied each year, only about 20 were chosen to attend each semester. The course was discontinued immediately after Sagan's death, but was later resumed by Professor Yervant Terzian in 2000.
SOURCE: WIKIPEDIA (http://en.wikipedia.org/wiki/Carl_Sagan)
Abstract: Mallows and Riordan [21] first defined the inversion polynomial, J n (q), for trees with n vertices and found its generating function. In the present work, we define inversion polynomials for ordered, plane and cyclic trees and find their values at q...
Abstract: Mallows and Riordan [21] first defined the inversion polynomial, J n (q), for trees with n vertices and found its generating function. In the present work, we define inversion polynomials for ordered, plane and cyclic trees and find their values at q...
Abstract: Mallows and Riordan [21] first defined the inversion polynomial, J n (q), for trees with n vertices and found its generating function. In the present work, we define inversion polynomials for ordered, plane and cyclic trees and find their values at q...
Abstract: We construct a family of partially ordered sets (posets) that are q-analogs of the set partition lattice. They are different from the q-analogs proposed by Dowling [Dow 73]. One of the important features of these posets is that their Whitney numbers ...
Abstract: We construct a family of partially ordered sets (posets) that are q-analogs of the set partition lattice. They are different from the q-analogs proposed by Dowling [Dow 73]. One of the important features of these posets is that their Whitney numbers ...
Abstract: We construct a family of partially ordered sets (posets) that are q-analogs of the set partition lattice. They are different from the q-analogs proposed by Dowling [Dow 73]. One of the important features of these posets is that their Whitney numbers ...
Abstract: We generalize Rota's theorem characterizing the Mobius function of a geometric lattice in terms of subsets of atoms containing no broken circuit and give applications to the weak Bruhat order of a finite Coxeter group and the Tamari lattices. We also...
Abstract: We generalize Rota's theorem characterizing the Mobius function of a geometric lattice in terms of subsets of atoms containing no broken circuit and give applications to the weak Bruhat order of a finite Coxeter group and the Tamari lattices. We also...
Abstract: We generalize Rota's theorem characterizing the Mobius function of a geometric lattice in terms of subsets of atoms containing no broken circuit and give applications to the weak Bruhat order of a finite Coxeter group and the Tamari lattices. We also...
Abstract: hyperplane arrangement, semimodular supersolvable lattice
Abstract: The generalized Euler number E njk counts the number of permutations of f1; 2; : : : ; ng which have a descent in position m if and only if m is divisible by k. The classical Euler numbers are the special case when k = 2. In this paper, we study divi...
Abstract: The generalized Euler number E njk counts the number of permutations of f1; 2; : : : ; ng which have a descent in position m if and only if m is divisible by k. The classical Euler numbers are the special case when k = 2. In this paper, we study divi...
Abstract: The generalized Euler number E njk counts the number of permutations of f1; 2; : : : ; ng which have a descent in position m if and only if m is divisible by k. The classical Euler numbers are the special case when k = 2. In this paper, we study divi...
Abstract: We study a sequence, c, which encodes the lengths of blocks in the Thue-Morse sequence. In particular, we show that the generating function for c is a simple product. Consider the sequence c : c 0 ; c 1 ; c 2 ; c 3 ; : : : = 1; 3; 4; 5; 7; 9; 11; 12;...
Abstract: Proposed running head: Send proofs to: Sequence related to Thue-Morse
Abstract: We study a sequence, c, which encodes the lengths of blocks in the Thue-Morse sequence. In particular, we show that the generating function for c is a simple product. Consider the sequence c : c 0 ; c 1 ; c 2 ; c 3 ; : : : = 1; 3; 4; 5; 7; 9; 11; 12;...
Abstract: We study a sequence, c, which encodes the lengths of blocks in the Thue-Morse sequence. In particular, we show that the generating function for c is a simple product. Consider the sequence c : c 0 ; c 1 ; c 2 ; c 3 ; : : : = 1; 3; 4; 5; 7; 9; 11; 12;...
Abstract:
Abstract: We find the maximum number of maximal independent sets in two families of graphs: all graphs with n vertices and at most r cycles, and all such graphs that are also connected. In addition, we characterize the extremal graphs. This proves that a conje...
Abstract: Let D n;k be the family of linear subspaces of R n given by all equations of the form ffl 1 x i 1 = ffl 2 x i 2 = : : : = ffl k x i k ; for 1 i 1 ! : : : ! i k n and (ffl 1 ; : : : ; ffl k ) 2 f+1; \Gamma1g k . Also let B n;k;h be D n;k enlarged by t...