45 Intuition about the cotangent complex? 2009-10-26T13:00:24.520

31 What is a deformation of a category? 2009-11-13T14:59:36.503

28 Deformation theory and differential graded Lie algebras 2009-10-12T21:08:46.623

27 Deformation theory of representations of an algebraic group 2009-10-15T05:26:10.217

22 Accumulation of algebraic subvarieties: Near one subvariety there are many others (?) 2011-05-28T15:31:39.680

22 Why are derived categories natural places to do deformation theory? 2012-11-01T00:47:44.990

21 algebraic group G vs. algebraic stack BG 2009-10-16T08:08:15.023

21 Introduction to deformation theory (of algebras)? 2010-01-16T19:30:13.450

21 A matrix algebra has no deformations? 2011-11-15T20:01:13.667

21 Massey Products vs. $A_\infty$-Structures 2012-03-26T22:14:36.847

21 Strict applications of deformation theory in which to dip one's toe 2013-06-20T04:18:25.633

20 Almost Complex Structure approach to Deformation of Compact Complex Manifolds 2012-06-18T15:56:57.990

18 Is a 'generic' variety nonsingular? Or singular? 2010-03-07T10:49:21.143

17 Kontsevich's conjectures on the Grothendieck-Teichmüller group? 2010-10-14T13:38:24.927

17 Proof of Hensel's lemma by using the deformation theory 2013-09-10T21:07:07.140

16 Why do my quantum group books avoid homotopical language? 2010-03-03T16:19:25.620

16 Example of a smooth morphism where you can't lift a map from a nilpotent thickening? 2010-04-21T05:38:40.963

16 What is an explicit example of a variety X which is finite over Spec F_p but which does not lift to a scheme Y which is finite and flat over Spec Z_p? 2011-05-05T02:59:02.313

16 obstruction theories in algebraic geometry 2011-06-15T11:46:39.500

16 Accumulation of algebraic subvarieties: Near one subvariety there are many others (?), 3 2011-10-11T22:01:29.123

14 Deformations of the punctured affine plane 2013-01-14T16:35:20.923

13 Grothendieck-Messing theory for finite flat group schemes 2010-08-13T15:37:21.897

13 Deformations of semisimple Lie algebras 2010-11-26T18:42:08.527

13 Les deux théorèmes d'existence en théorie formelle des modules 2012-05-15T20:17:08.533

13 Are deformations of a scheme some kind of a "derived gerbe" under the cotangent complex? 2014-02-03T06:50:16.977

13 Unobstructedness of braided deformations of symmetric monoidal categories in higher category theory 2014-06-11T23:35:35.777

13 Is Hironaka's example the only known deformation of Kähler manifolds with non-Kähler central fibre? 2014-11-12T06:07:31.857

13 Infinitesimal deformations of the formal group of $\mathbb{G}_m$ 2015-05-06T16:18:53.353

13 Squeezing physics out of formal deformation quantizations 2015-12-15T17:52:49.980

12 Lie groups vs. algebraic groups and deformations 2012-05-12T05:21:52.930

12 Associativity of Kontsevich's star product up to second order 2015-03-16T15:08:07.843

12 Maurer-Cartan equation for Lie groups/homogeneous space vs. Maurer-Cartan of deformation theory 2016-05-16T08:37:08.037

11 Extended Deformation Theory (dg-Lie algebra principle in positive characteristic?) 2014-03-06T16:27:31.310

11 Obstructed automorphisms of schemes 2016-02-05T14:24:58.183

11 Kodaira-Spencer maps and deformation theory 2017-09-01T21:07:23.103

11 Finite dimensional approximation of Donaldson theory 2017-11-30T23:06:09.290

10 Are periods of rigid Calabi-Yau threefolds over $Q$ algebraic? 2010-06-13T21:22:16.420

10 "Spec" of graded rings? 2010-07-14T23:39:20.950

10 Is the generic deformation of a symplectic variety affine? 2010-12-12T02:55:38.013

10 Deformation theory over the field of algebraic numbers 2010-12-30T03:46:05.993

10 Kontsevich's formality theorem from an explicit homotopy 2011-03-24T19:17:17.313

10 Deformations of some simple quotient stacks. 2011-03-27T08:46:40.383

10 Accumulation of algebraic subvarieties: Near one subvariety there are many others (?), 2 2011-05-29T12:00:45.423

10 What is the universal deformation of the formal additive group $\widehat{\mathbb{G}}_a$ over $\mathbb{F}_p$? 2012-11-27T10:53:50.870

10 Surfaces with $q=2$ and generically finite Albanese map 2016-08-22T13:36:55.117

10 DGLA or $L_{\infty}$-algebra controlling the deformation of Einstein metrics and instantons 2017-03-03T15:25:02.207

10 What does deformation theory have to do with Serre duality? 2017-07-18T19:57:10.143

9 Deformations and the dual numbers 2010-07-27T15:12:24.967

9 Geometric meaning of small extensions ? 2011-01-27T17:12:20.250

9 Reverse Engineering to find deformation problem (from cohomology groups)? 2011-04-11T02:20:40.720

9 In the dictionary between Poisson and Quantum, what corresponds to Coisotropic? 2011-05-10T03:34:24.540

9 Deformations of smooth projective hypersurfaces and the Jacobian ring 2012-07-17T12:07:42.937

9 Motivation behind the definition of hochschild cohomology 2014-07-17T06:33:29.680

9 Deformations of Ext rings 2015-06-24T23:50:08.493

9 Étale morphisms in SDG 2016-03-30T13:25:46.897

9 derived schemes and perfect obstruction theories 2017-01-24T13:39:57.903

8 "A theory of generalized Donaldson-Thomas invariants" by Joyce & Song 2009-10-28T01:25:52.930

8 obstruction to smooth lifting of smooth schemes 2010-01-04T13:47:13.763

8 Kodaira-Spencer map in a concrete instance 2010-04-23T12:59:28.983

8 About the Serre-Tate theorem 2011-03-12T13:06:40.763

8 A simple proof of the Weyl algebra's rigidity. 2011-06-28T22:03:26.187

8 Tangent space of the stack $\overline{\mathcal{M}}_{g,n}(X,\beta)$. 2012-11-30T08:42:45.097

8 Algebraic definition of the Kuranishi map 2013-01-14T23:38:31.743

8 When does the categorical definition of a module work? 2013-07-06T12:08:50.117

8 Why can you deform singularities in two dimensions but not in higher dimensions? 2014-01-30T08:57:56.133

8 Kodaira-Spencer theory of deformation done right 2014-06-21T15:43:22.353

8 Deformations of a blowup 2015-02-20T16:12:54.323

8 Inverse Galois problem for $GL_2$ of a compact local ring 2015-08-12T14:28:33.143

8 Cohomology of tangent sheaf of a singular hypersurface 2016-05-23T01:16:57.420

8 Some examples of $\mathbb Q$-Gorenstein smoothing 2016-07-18T11:59:07.870

8 Deligne's letter to Millson 2016-09-15T19:20:04.803

8 Degeneration of curves inside a family of surfaces 2018-01-18T19:04:02.003

7 What is an example of a smooth variety over a finite field F_p which does not lift to Z_p? 2009-10-13T14:29:56.533

7 Liftability of Enriques Surfaces (from char. p to zero) 2010-04-11T18:58:02.790

7 Deformations of hypersurfaces 2010-08-18T16:55:25.327

7 Innovations in deformation theory 2010-09-30T04:45:31.997

7 Deformation theory of co-$A_\infty$ structures. 2010-12-27T17:35:21.270

7 Looking for a particular family of C.Y quintics 2011-01-09T19:07:45.810

7 Relationship between Hilbert schemes and deformation spaces 2011-04-18T19:12:00.477

7 How to define the equivalence of Maurer-Cartan elements in an $L_{\infty}$-algebra? 2012-08-30T05:22:48.577

7 Deformation of Noether's first theorem 2012-09-09T17:18:33.400

7 on a Deformation long exact sequence of moduli space of stable maps 2012-10-03T16:50:24.427

7 Def-Obs theory of sheaves with fixed determinant on CY3. 2012-11-10T11:17:11.070

7 Formal series convergence in deformation quantization and $C^*$-condition 2013-09-01T15:58:10.090

7 What's the relation between the heat kernel proof of the index theorem and deformation quantization? 2013-10-06T02:07:36.817

7 Higher commutators in E_n algebras and the Maurer--Cartan equation 2013-11-08T02:39:31.183

7 Projective embedding in families of curves 2014-01-21T12:09:40.297

7 alternative to Kontsevich formality 2014-02-10T21:41:21.347

7 formally smooth functor 2014-06-03T11:38:56.607

7 Reference or explanation: Cup products, deformations of complex structure and Mirror Symmetry 2015-03-17T15:06:44.650

7 Specialisation of rigid varieties 2015-06-25T06:06:50.743

7 Lefschetz morphisms from the relative tangent sheaf exact sequence? 2015-10-11T10:46:10.380

7 "Tubular neighbourhood" for non-reduced curves 2016-09-21T12:58:00.697

7 Deformation invariance of Fano varieties 2017-04-07T12:51:48.393

7 Clarification on relationship between Grothendieck-Messing and Honda systems 2017-10-08T06:10:10.540

6 A versal deformation of a simple node 2010-09-02T18:20:31.217

6 Words in two infinitismal rotations 2010-12-14T23:09:51.843

6 "Twisted" universal enveloping algebra? 2011-02-14T19:58:28.530

6 Extension of the formality theorem? 2011-02-21T05:44:15.263