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The "What Is...?" column

I very much enjoy reading the "What Is...?" column in the Notices of the AMS. Unfortunately, there seemed to be no index to this column. I have therefore created this one in the hope that it'll be helpful to others as well.

  1. What is...a virtual knot? — Daniel S. Silver, Susan G. Williams, May 2017
  2. What is... tropical geometry? — Eric Katz, April 2017
  3. What is... an elliptic curve? — Harris B. Daniels and Álvaro Lozano-Robledo, March 2017
  4. What is... Benford's Law? — Arno Berger, Theodore P. Hill, February 2017
  5. What is...a complex symmetric operator? — Stephan Ramon Garcia, January 2017
  6. What is... symplectic geometry? — Tara S. Holm, December 2016
  7. What is...a blender? — Ch. Bonatti, S. Crovisier, L. J. Díaz, A. Wilkinson, November 2016
  8. What is...a multiple orthogonal polynomial? — Andrei Martínez-Finkelshtein and Walter Van Assche, October 2016
  9. What is...a Leavitt path algebra? — Gene Abrams, September 2016
  10. What is...a Diophantine m-tuple? — Andrej Dujella, August 2016
  11. What is... aperiodic order? — Michael Baake, David Damanik and Uwe Grimm, June/July 2016
  12. What is... Nash equilibrium? — Rajiv Sethi and Jörgen Weibull, May 2016
  13. What is...a quandle? — Sam Nelson, April 2016
  14. What is...an anabelian scheme? — Kirsten Wickelgren, March 2016
  15. What is... Gauss curvature? — Editors, February 2016
  16. What is...an ergodic transformation? — Cesar E. Silva, January 2016
  17. What is...an automatic sequence? — Eric Rowland, March 2015
  18. What is...a graphon? — Daniel Glasscock, January 2015
  19. What is...a perfectoid space? — Bhargav Bhatt, October 2014
  20. What is...a period? — Stefan Müller-Stach, September 2014
  21. What is...a Rauzy fractal? — Pierre Arnoux, Edmund Harriss, August 2014
  22. What is...a spectrahedron? — Cynthia Vinzant, May 2014
  23. What is... cyclic sieving? — Victor Reiner, Dennis Stanton, Dennis White, February 2014
  24. What is...a flag algebra? — Alexander A. Razborov, November 2013
  25. What is...the Leech lattice? — Chuanming Zong, October 2013
  26. What is...the p-adic Mandelbrot set? — Joseph H. Silverman, September 2013
  27. What is...a frame? — Christopher Heil, June/July 2013
  28. What is...a tensegrity? — Robert Connelly, January 2013
  29. What is...a Shimura variety? — James S. Milne, December 2012
  30. What is... essential dimension? — Zinovy Reichstein, November 2012
  31. What is...a scissors congruence? — Johan L. Dupont, October 2012
  32. What is... cop number? — Anthony Bonato, September 2012
  33. What is...an octopus decomposition? — Larry Conlon, August 2012
  34. What is...a biholomorphic mapping? — Eric Bedford, June/July 2012
  35. What is...an approximate group? — Ben Green, May 2012
  36. What is... data mining? — Mauro Maggioni, April 2012
  37. What is...an affine sphere? — Daniel J. F. Fox, March 2012
  38. What is...a pseudoconvex domain? — R. Michael Range, February 2012
  39. What is...a Fenchel conjugate? — Heinz H. Bauschke, Yves Lucet, January 2012
  40. What is...a natural proof? — Timothy Y. Chow, December 2011
  41. What is...a stationary measure? — Alex Furman, October 2011
  42. What is... Thompson's group? — J. W. Cannon, W. J. Floyd, September 2011
  43. What is...a derived stack? — Gabriele Vezzosi, August 2011
  44. What is...a resplendent structure? — Roman Kossak, June/July 2011
  45. What is...a infra-nilmanifold endomorphism?? — Karel Dekimpe, May 2011
  46. What is...a G2-manifold? — Spiro Karigiannis, April 2011
  47. What is... equivariant cohomology? — Loring W. Tu, March 2011
  48. What is...a free cumulant? — Jonathan Novak, Piotr Sniady, February 2011
  49. What is... persistent homology? — Shmuel Weinberger, January 2011
  50. What is...a mock modular form? — Amanda Folsom, December 2010
  51. What is... cost? — Damien Gaboriau, November 2010
  52. What is...a linear algebraic group? — Skip Garibaldi, October 2010
  53. What is...a sandpile? — Lionel Levine, James Propp, September 2010
  54. What is...a paraproduct? — Árpád Bényi, Diego Maldonado, Virginia Naibo, August 2010
  55. What is...a kinetic solution for degenerate parabolic-hyperbolic equations? — Gui-Qiang G. Chen, Benoît Perthame, June/July 2010
  56. What is...a perverse sheaf? — Mark Andrea de Cataldo, Luca Migliorini, May 2010
  57. What is...a Wilf-Zeilberger pair? — Akalu Tefera, April 2010
  58. What is...a Gaussian entire function? — Fedor Nazarov, Mikhail Sodin, March 2010
  59. What is...a halting probability? — Cristian S. Calude, G. J. Chaitin, February 2010
  60. What is...an Oka manifold? — Finnur Larusson, January 2010
  61. What is...a Rota-Baxter algebra? — Li Guo, December 2009
  62. What is...a Legendrian knot? — Joshua M. Sabloff, November 2009
  63. What is...Stanley depth? — M. R. Pournaki, S. A. Seyed Fakhari, M. Tousi, S. Yassemi, October 2009
  64. What is...the complex dual to the real sphere? — Simon Gindikin, September 2009
  65. What is...the parity phenomenon? — John Friedlander, Henryk Iwaniec, August 2009
  66. What is...an elliptic genus? — Serge Ochanine, June/July 2009
  67. What is...measure rigidity? — Manfred Einsiedler, May 2009
  68. What is...Lehmer's number? — Eriko Hironaka, March 2009
  69. What is...a skein module? — W. B. Raymond Lickorish, February 2009
  70. What is...the Schwarzian derivative? — Valentin Ovsienko, Sergei Tabachnikov, January 2009
  71. What is...a period domain? — James Carlson, Phillip Griffiths, December 2008
  72. What is...a cross ratio? — François Labourie, November 2008
  73. What is...stable commutator length? — Danny Calegari, October 2008
  74. What is...an ∞-category? — Jacob Lurie, September 2008
  75. What is...outer space? — Karen Vogtmann, August 2008
  76. What is...forcing? — Thomas Jech, June/July 2008
  77. What is...a toric variety? — Ezra Miller, May 2008
  78. What is...property A? — Piotr Nowak, Guoliang Yu, April 2008
  79. What is...a systole? — Marcel Berger, March 2008
  80. What is...JPEG? — David Austin, February 2008
  81. What is...quantum chaos? — Ze'ev Rudnick, January 2008
  82. What is...a cluster algebra? — Andrei Zelevinsky, December 2007
  83. What is...Boy's surface? — Robion Kirby, November 2007
  84. What is...a Woodin cardinal? — John Steel, October 2007
  85. What is...a Higgs bundle? — Steve Bradlow, Oscar García-Prada, Peter Gothen, September 2007
  86. What is...a Galois representation? — Mark Kisin, June/July 2007
  87. What is...an infinite swindle? — Valentin Poénaru, May 2007
  88. What is...a tropical curve? — Grigory Mikhalkin, April 2007
  89. What is...a minimal model? — János Kollár, March 2007
  90. What is...a Young tableau? — Alexander Yong, February 2007
  91. What is...a projective structure? — William Goldman, January 2007
  92. What is...a quasiconformal mapping? — Juha Heinonen, December 2006
  93. What is...Turing reducibility? — Martin Davis, November 2006
  94. What is...a bad end? — Charles Epstein, October 2006
  95. What is...a quasicrystal? — Marjorie Senechal, September 2006
  96. What is...a strange attractor? — David Ruelle, August 2006
  97. What is...a coarse space? — John Roe, June/July 2006
  98. What is...percolation? — Harry Kesten, May 2006
  99. What is...a syzygy? — Roger Wiegand, April 2006
  100. What is...a graph minor? — Bojan Mohar, March 2006
  101. What is...a quantum group? — Shahn Majid, January 2006
  102. What is...a random matrix? — Persi Diaconis, December 2005
  103. What is...a Gröbner basis? — Bernd Sturmfels, November 2005
  104. What is...a pseudoholomorphic curve? — Simon Donaldson, October 2005
  105. What is...a Lefschetz pencil? — Robert Gompf, September 2005
  106. What is...a compacton? — Philip Rosenau, August 2005
  107. What is...property tau? — Alex Lubotzky, June/July 2005
  108. What is...a horseshoe? — Mike Shub, May 2005
  109. What is...a dimer? — Richard Kenyon, Andrei Okounkov, March 2005
  110. What is...a brane? — Gregory Moore, February 2005
  111. What is...an open book? — Emmanuel Giroux, January 2005
  112. What is...a flip? — Alessio Corti, December 2004
  113. What is...a motive? — Barry Mazur, November 2004
  114. What is...a topos? — Luc Illusie, October 2004
  115. What is...a grope? — Peter Teichner, September 2004
  116. What is...an expander? — Peter Sarnak, August 2004
  117. What is...an operad? — James Stasheff, June/July 2004
  118. What is...a free lunch? — Fredy Delbaen, Walter Schachermayer, May 2004
  119. What is...a billiard? — Yakov Sinai, April 2004
  120. What is...a quasi-morphism? — D. Kotschick, February 2004
  121. What is...a curvelet? — Emmanuel Candès, December 2003
  122. What is...a dessin d'enfant? — Leonardo Zapponi, August 2003
  123. What is...a bubble tree? — Thomas Parker, June/July 2003
  124. What is...a worm? — Harold Boas, May 2003
  125. What is...a stack? — Dan Edidin, April 2003
  126. What is...a train track? — Lee Mosher, March 2003
  127. What is...a gerbe? — Nigel Hitchin, February 2003
  128. What is...a shtuka? — David Goss, January 2003
  129. What is...an alteration? — Frans Oort, December 2002
  130. What is...a building? — Kenneth S. Brown, November 2002
  131. What is...the monster? — Richard Borcherds, October 2002
  132. What is...an amoeba? — Oleg Viro, September 2002
Last change: 2017/04/27
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