|Time||Jan 9 16:20~16:40|
|Title||Exactly 14 intrinsically knotted graphs have 21 edges.|
Johnson, Kidwell and Michacl showed that intrinsically knotted graphs have at least 21 edges. Also it is known that K7 and the 13 graphs obtained by triangle-Y moves from K7 are intrinsically knotted graphs with 21 edges. In this paper, we proved that only these 14 graphs are intrinsically knotted graph with 21 edges.