The authors construct a nontrivial four-term exact sequence showing Ext^2(ℓ2, ℓ2) ≠ 0, and also Ext^2(ℓ1, K) ≠ 0 in quasi Banach spaces.
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On the ${\Ext}^2$-problem for Hilbert spaces
The authors construct a nontrivial four-term exact sequence showing Ext^2(ℓ2, ℓ2) ≠ 0, and also Ext^2(ℓ1, K) ≠ 0 in quasi Banach spaces.