ScalingStacks

Corollary 4 If $M$ is a tensor product of ${\mathcal{F}}(\cap_{i,n})$ and invertible complexes of bimodules, and if $f:M\to N$ is an isomorphism in $\mathcal{K}_{n}^{n-1},$ then the only other isomorphism from $M$ to $N$ is $-f.$ Same with $\cup_{i,n-1}$ instead of $\cap_{i,n}.$