MEMOIRS

APPENDIX BThe tubular symbols( ) ( ) 22, 2 24( ) 224( ) 22 ( )24 ,224( ) ( ) 33, 333( )2 21 3( 2 2)1 31 3( ) ( ) 2 22 2, 2 22 2( ) 2 22 22 2 , (2 2 | 2)1 2() ( 2 42 4, 1 21 21 2( )3 31 2( 3 3)1 21 2(236)(244)((333))2 2 21 1 2( 2 2 2)1 1 21 1 2(2222))Table B.1. The 17 equivalence classes of tubular symbolsSee 0.4.5 for the definition of symbols. Two symbols are called equivalent ifthey yield the same Grothendieck group with Euler form. The 17 boxes show the17 equivalence classes. We refer to [57] for details.119