Figure 10 . The type IIA brane-con(cid:12)guration in the middle describes the 4d/2d/0d coupled system on the left as the worldvolume theory of the D4/D2 L /D2 R -branes, see also (cid:12)gure 8. The worldvol- ume theory of the k D0-branes is shown on the right, see (cid:12)gure 9 for more details. Its partition function computes the k -instanton partition function of the 4d/2d/0d coupled system.