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Tingley’s problem for the direct sum of uniformly closed extremely C-regular subspaces with the $$\ell ^{1}$$-sum norm

Crossref DOI link: https://doi.org/10.1007/s43036-025-00427-z

Published Online: 2025-02-25

Published Print: 2025-04

Update policy: https://doi.org/10.1007/springer_crossmark_policy

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