harc.edu的 10 大竞争对手

energy.gov

The Department of Energy’s 17 National Laboratories are powerhouse institutions that have led scientific innovation in the United States for more than 70 years.

mathworld.wolfram.com

A connected graph G is distance-regular if for any vertices x and y of G and any integers i,j=0, 1, ...d (where d is the graph diameter), the number of vertices at distance i from x and distance j from y depends only on i, j, and the graph distance between x and y, independently of the choice of x and y. In particular, a distance-regular graph is a graph for which there exist integers b_i,c_i,i=0,...,d such that for any two vertices x,y in G and distance i=d(x,y), there are exactly c_i...

mersenne.org

great internet mersenne prime search - finding world record primes since 1996. gimps is an organized search for mersenne prime numbers using provided free software.

perfsci.com

Entdecken Sie auf perfsci.com die Welt, die uns umgibt, nährt, bereichert und fasziniert. Entdecken Sie Freizeit-, Fitness- und aktuelle Themen, die wichtig sind.

physics.nist.gov

NIST promotes U.S. innovation and industrial competitiveness by advancing measurement science, standards, and technology in ways that enhance economic security and improve our quality of life.