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2-category 2-category-theory abelian-categories adjoint algebra algebraic algebraic-geometry algebraic-topology analysis analytic-geometry arithmetic arithmetic-geometry book bundles calculus categorical categories category category-theory chern-weil-theory cohesion cohesive-homotopy-type-theory cohomology colimits combinatorics complex complex-geometry computable-mathematics computer-science constructive cosmology deformation-theory descent diagrams differential differential-cohomology differential-equations differential-geometry digraphs duality elliptic-cohomology enriched fibration foundation foundations functional-analysis functor gauge-theory gebra geometric-quantization geometry graph graphs gravity grothendieck group group-theory harmonic-analysis higher higher-algebra higher-category-theory higher-differential-geometry higher-geometry higher-lie-theory higher-topos-theory homological homological-algebra homotopy homotopy-theory homotopy-type-theory index-theory integration integration-theory internal-categories k-theory lie-theory limits linear linear-algebra locale localization logic mathematics measure measure-theory modal modal-logic model model-category-theory monad monads monoidal monoidal-category-theory morphism motives motivic-cohomology nlab noncommutative noncommutative-geometry number-theory of operads operator operator-algebra order-theory pages pasting philosophy physics pro-object probability probability-theory quantization quantum quantum-field quantum-field-theory quantum-mechanics quantum-physics quantum-theory question representation representation-theory riemannian-geometry scheme schemes set set-theory sheaf simplicial space spin-geometry stable-homotopy-theory stack string string-theory superalgebra supergeometry svg symplectic-geometry synthetic-differential-geometry terminology theory topology topos topos-theory tqft type type-theory universal variational-calculus

1. • CommentRowNumber1.
   • CommentAuthornLab edit announcer
   • CommentTimeOct 19th 2018
   • PermaLink
   Author: nLab edit announcer
   Format: MarkdownItexAssociated root system, integral statements instead of over $\mathbb{R}$ of previous paragraph Ammar Husain <a href="https://ncatlab.org/nlab/revision/diff/del+Pezzo+surface/4">diff</a>, <a href="https://ncatlab.org/nlab/revision/del+Pezzo+surface/4">v4</a>, <a href="https://ncatlab.org/nlab/show/del+Pezzo+surface">current</a>

   Associated root system, integral statements instead of over $\mathbb{R}$ of previous paragraph

   Ammar Husain

   diff, v4, current

2. • CommentRowNumber2.
   • CommentAuthorRichard Williamson
   • CommentTimeOct 19th 2018
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   Author: Richard Williamson
   Format: MarkdownItexThanks very much! Welcome to editing the nLab!

   Thanks very much! Welcome to editing the nLab!

3. • CommentRowNumber3.
   • CommentAuthorUrs
   • CommentTimeJan 16th 2023
   • PermaLink
   Author: Urs
   Format: MarkdownItexadded pointer to: On [[exceptional structures]] ([[exceptional Lie algebras]] and [[sporadic finite simple groups]]) via [[del Pezzo surfaces]]: * [[Yang-Hui He]], [[John McKay]], _Sporadic and Exceptional_ &lbrack;[arXiv:1505.06742](https://arxiv.org/abs/1505.06742)&rbrack; <a href="https://ncatlab.org/nlab/revision/diff/del+Pezzo+surface/7">diff</a>, <a href="https://ncatlab.org/nlab/revision/del+Pezzo+surface/7">v7</a>, <a href="https://ncatlab.org/nlab/show/del+Pezzo+surface">current</a>

   added pointer to:

   On exceptional structures (exceptional Lie algebras and sporadic finite simple groups) via del Pezzo surfaces:

   • Yang-Hui He, John McKay, Sporadic and Exceptional [arXiv:1505.06742]

   diff, v7, current