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15:1915:19, 5 December 2019 diff hist +5 Abelian sandpile model Corrected language
15:1415:14, 5 December 2019 diff hist +276 Abelian sandpile model Moved reference to chip-firing games to the top, reformulated it and added reference.
15:0115:01, 5 December 2019 diff hist +304 Chip-firing game Corrected statement of the order of the group, which neglected that the number of dollars held by the bank is part of the configuration, too. Also added references to the sandpile model.
14:4014:40, 5 December 2019 diff hist +400 Abelian sandpile model Clarified definition of graph Laplacian

20:3920:39, 4 December 2019 diff hist +190 Abelian sandpile model Added note about the limit for dropping infinitely many grains at the origin, and added references.
20:3520:35, 4 December 2019 diff hist +32 m Abelian sandpile model Named references to be able to cite them elsewhere in the article.
20:2620:26, 4 December 2019 diff hist +608 Abelian sandpile model Added references
17:2517:25, 4 December 2019 diff hist +458 Abelian sandpile model Added reference
16:1416:14, 4 December 2019 diff hist +1,244 Abelian sandpile model Added section about scaling limits of the sandpile identity.
13:3513:35, 4 December 2019 diff hist +3 Abelian sandpile model Exchanged image with one having the same color coding as the other ones in the article, and whose generation is also better described in the meta data.
13:2413:24, 4 December 2019 diff hist +3,806 Abelian sandpile model Added the extended sandpile model to section "Generalizations and related models"

15:3315:33, 3 December 2019 diff hist +62 Abelian sandpile model Structuring sections
15:2915:29, 3 December 2019 diff hist +77 Abelian sandpile model Moving graph Laplacian to definition of the sandpile group
15:2415:24, 3 December 2019 diff hist +3,081 Abelian sandpile model Explaining transient and recurrent configurations, simplifying definition of sandpile group (while stating alternative names)
14:1014:10, 3 December 2019 diff hist +1,058 Abelian sandpile model Related the definitions on finite rectangular grids of Z^2 and on arbitrary finite multigraphs.
12:4812:48, 3 December 2019 diff hist +3,983 Abelian sandpile model Changed definition to describe original BTW model on finite grids of Z^2 (such that discussion of criticality and the sandpile group makes sense). Moved previous definition on the whole of Z^2 to a later section as a generalization.