%0 Journal Article %A Thibault Didier Décoppet %T Extension Theory and Fermionic Strongly Fusion 2-Categories (with an Appendix by Thibault Didier Décoppet and Theo Johnson-Freyd) %J Symmetry, integrability and geometry: methods and applications %D 2024 %V 20 %U http://geodesic.mathdoc.fr/item/SIGMA_2024_20_a91/ %G en %F SIGMA_2024_20_a91