• algebraic geometry, given a Deligne–Mumford stack X, a perfect obstruction theory for X consists of: a perfect two-term complex E = [ E − 1 → E 0 ] {\displaystyle...
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  • {\text{Ext}}^{1}({\mathcal {E}},{\mathcal {E}})^{\vee }} which gives a perfect obstruction theory of dimension 0. In particular, this implies the associated virtual...
    10 KB (1,324 words) - 19:46, 17 December 2024
  • Leth's The Perfect Human, and von Trier gives Leth the task of remaking The Perfect Human five times, each time with a different "obstruction" (or obstacle)...
    12 KB (1,006 words) - 14:14, 24 February 2025
  • determined by the perfect obstruction theory and s0! is the refined Gysin homomorphism defined just as in Fulton's "Intersection theory". The same paper...
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  • Thumbnail for Kai Behrend
    made important contributions in the theory of algebraic stacks, Gromov–Witten invariants and Donaldson–Thomas theory (cf. Behrend function.) He is also...
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  • Virtual fundamental class (category Intersection theory)
    Deligne-Mumford stacks using the intrinsic normal cone and a perfect obstruction theory, but the first definitions are more amenable for constructing...
    9 KB (1,533 words) - 15:25, 30 January 2025
  • Thumbnail for Forbidden graph characterization
    Forbidden graph characterization (category Graph theory)
    finite obstruction set. Erdős–Hajnal conjecture Forbidden subgraph problem Matroid minor Zarankiewicz problem Diestel, Reinhard (2000), Graph Theory, Graduate...
    17 KB (1,224 words) - 20:13, 16 April 2025
  • Thumbnail for Algebraic number theory
    Algebraic number theory is a branch of number theory that uses the techniques of abstract algebra to study the integers, rational numbers, and their generalizations...
    40 KB (5,798 words) - 10:21, 25 April 2025
  • Thumbnail for Special relativity
    In physics, the special theory of relativity, or special relativity for short, is a scientific theory of the relationship between space and time. In Albert...
    186 KB (25,022 words) - 00:07, 28 May 2025
  • reflections. Near-line-of-sight (also NLOS) conditions refer to partial obstruction by a physical object present in the innermost Fresnel zone. Obstacles...
    44 KB (6,551 words) - 02:47, 21 February 2025
  • Thumbnail for Vacuum
    Vacuum (redirect from Perfect vacuum)
    pressure. Physicists often discuss ideal test results that would occur in a perfect vacuum, which they sometimes simply call "vacuum" or free space, and use...
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  • Thumbnail for Grigori Perelman
    supporting hyperplanes.[P89] As such, his construction provided further obstruction to the extension of a well-known theorem of Nikolai Efimov to higher...
    65 KB (6,324 words) - 10:19, 6 May 2025
  • Thumbnail for Cograph
    Cograph (category Perfect graphs)
    if every vertex order of the graph is a perfect order, since having no P4 means that no obstruction to a perfect order will exist in any vertex order. A...
    22 KB (2,689 words) - 18:27, 19 April 2025
  • Thumbnail for Threshold graph
    Threshold graph (category Perfect graphs)
    pp. 145–162. Golumbic, Martin Charles (1980), Algorithmic Graph Theory and Perfect Graphs, New York: Academic Press. 2nd edition, Annals of Discrete...
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  • near-perfect record in Jan. 6 cases. But it's starting to stumble". Politico. Retrieved January 30, 2024. "Supreme Court appears divided over obstruction law...
    19 KB (1,707 words) - 06:04, 27 May 2025
  • Fermion doubling (category Lattice field theory)
    to a naive application of the inverse Wick transformation. The theory has an obstruction that does not allow for the simple replacement of p 4 = ± i ω...
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  • Thumbnail for Mueller special counsel investigation
    associates and their connection to Russian officials and espionage Possible obstruction of justice by Trump and his associates While the investigation found...
    215 KB (17,847 words) - 02:40, 28 May 2025
  • productive career. On November 15, 2007, Bonds was indicted for perjury and obstruction of justice based on his grand jury testimony in this investigation. The...
    20 KB (2,387 words) - 08:39, 1 April 2025
  • Thumbnail for First impeachment of Donald Trump
    adopted two articles of impeachment against Trump: abuse of power and obstruction of Congress. On February 5, 2020, the Senate voted to acquit Trump on...
    249 KB (12,950 words) - 23:15, 26 May 2025
  • Thumbnail for 2019 Trump–Ukraine scandal
    of impeachment. Trump was impeached on charges of abuse of power and obstruction of Congress, but was acquitted by the Senate. On December 3, 2019, as...
    396 KB (35,450 words) - 16:07, 27 May 2025
  • Thumbnail for Preamble to the United States Constitution
    Philadelphia. We the People of the United States, in order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the...
    79 KB (12,380 words) - 07:15, 25 May 2025
  • Thumbnail for Arf invariant
    Arf invariant (category Surgery theory)
    F*/(F*)2, which can be identified with H1(F, F2) by Kummer theory. If the field K is perfect, then every nonsingular quadratic form over K is uniquely...
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  • In number theory and algebraic geometry, a rational point of an algebraic variety is a point whose coordinates belong to a given field. If the field is...
    21 KB (3,028 words) - 19:56, 26 January 2023
  • Pathwidth (category Graph minor theory)
    1007/s004530010025, S2CID 9690525. Berge, Claude (1967), "Some classes of perfect graphs", Graph Theory and Theoretical Physics, New York: Academic Press, pp. 155–165...
    66 KB (7,684 words) - 15:08, 5 March 2025
  • Thumbnail for Airy disk
    Airy pattern are descriptions of the best-focused spot of light that a perfect lens with a circular aperture can make, limited by the diffraction of light...
    31 KB (4,806 words) - 08:31, 24 May 2025
  • Thumbnail for Huayan
    li to elaborate his theory of the fourfold dharmadhātu (that of: [1] phenomena, shih; [2] principle, li; [3] the non-obstruction of principle and phenomena...
    137 KB (17,840 words) - 05:41, 25 May 2025
  • Thumbnail for William Barr
    could make a determination on obstruction of justice (the report specifically stated "that Congress may apply obstruction laws") and that "these reports...
    246 KB (24,043 words) - 15:32, 27 May 2025
  • Thumbnail for Heawood graph
    Hein van der Holst (2006). "Graphs and obstructions in four dimensions" (PDF). Journal of Combinatorial Theory, Series B. 96 (3): 388–404. doi:10.1016/j...
    10 KB (1,001 words) - 06:23, 6 March 2025
  • Thumbnail for Lift (force)
    sections on theory of flight are understandable with a passing knowledge of calculus and physics. Craig, Paul P. (1957). "Observation of Perfect Potential...
    100 KB (13,294 words) - 15:43, 24 May 2025
  • this path have completely freed themselves of all obstructions and afflictions and are thus perfected or fulfilled (niṣṭhā). According to the MS, one has...
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