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--- blog:2023-05-07 [2023/05/08 06:09] – pzhou
+++ blog:2023-05-07 [2023/06/25 15:53] (current) – external edit 127.0.0.1
@@ Line 34: / Line 34: @@
 well, a determinant line is a kernel minus cokernel, taking determinants.
-===== 1001 times, what is spin? =====
+===== What is orientation? =====
-and why do we care about spin structure?
+If $L$ satisfies certain topological condition, then the moduli space of disks ending on $L$ is orientable.
+But, how do we define the A-infinity structures? Why we count some disks with a negative sign? When we say we orient the 0-dim moduli space of the disks, that means plus-minus signs.