Results 21 to 30 of about 4,113 (255)
On sunflowers and matrix multiplication [PDF]
computational complexity, 2012 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Noga Alon +2 more
openaire +5 more sources
Discrete Analysis, 2020 Coding for sunflowers, Discrete Analysis 2020:2, 8 pp. The sunflower problem is an old problem of Erdős and Rado in extremal set theory. A _sunflower_ is defined to be a collection of sets $A_1,\dots,A_r$ such that if $B=\bigcap_{i=1}^rA_i$ is their ...
Anup Rao
doaj +1 more source
Why do sunflowers have invisible colors?
eLife, 2022 In the common sunflower, patterns of UV-absorbing pigments are controlled by a newly identified regulatory region and may be under the influence of environmental factors.
Jason Laurich, Anna M O'Brien
doaj +1 more source
Plant Protection Science, 2023 The main purpose of the study was to examine the potential of crops, such as soybeans (Glycine max), sunflowers (Helianthus annuus), alfalfa (Medicago sativa), and sorghum (Sorghum bicolor), as trap crops for Halyomorpha halys. We monitored the abundance
Luka Batistič +2 more
doaj +1 more source
“The Sunflower’s Bloom of Women’s Equality”: New Contexts for Mary Cassatt’s La Femme au tournesol
Panorama, 2022 Far from a symbol of restrictive, retrograde femininity (or essentialist fertility), the sunflower and its bearer are beacons of Cassatt’s fervent feminism, a latent symbolism that emerges when the painting is considered within the context of the ...
Nicole Georgopulos
doaj +1 more source
Sunflowers and -intersecting families
AKCE International Journal of Graphs and Combinatorics, 2020 Let stand for the least number so that if is an arbitrary -uniform, -intersecting set system, where , and has more than elements, then contains a sunflower with petals. We give an upper bound for .
Gábor Hegedűs
doaj +1 more source
Frontiers in Plant Science, 2023 IntroductionMany atmospheric aerosols are hygroscopic and play an important role in cloud formation. Similarly, aerosols become sites of micro-condensation when they deposit to the upper and lower surfaces of leaves.
Juergen Burkhardt +4 more
doaj +1 more source
AgricultureThe diameter of the sunflower flower head and the thickness of its margins are important crop phenotypic parameters. Traditional, single-dimensional two-dimensional imaging methods often struggle to balance precision with computational efficiency.
Qiang Wang +4 more
doaj +1 more source
Sunflowers and Quasi-sunflowers from Randomness Extractors.
Electron. Colloquium Comput. Complex., 2018 The Erdös-Rado sunflower theorem (Journal of Lond. Math. Soc. 1960) is a fundamental result in combinatorics, and the corresponding sunflower conjecture is a central open problem. Motivated by applications in complexity theory, Rossman (FOCS 2010) extended the result to quasi-sunflowers, where similar conjectures emerge about the optimal parameters for
Xin Li 0006 +2 more
openaire +5 more sources
Oil Crop Science, 2022 To clarify the quality characters, understand the genetic diversity and screen elite lines among different oilseed sunflowers, the contents of crude fat, oleic acid, linoleic acid, palmitic acid and stearic acid of 525 oil sunflowers (including 375 ...
Ling Wang +8 more
doaj +1 more source