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They are shown to be equivalent after extension to paired operators on <jats:inline-formula><jats:alternatives><jats:tex-math>$$L^2({\\mathbb {T}}) \\oplus L^2({\\mathbb {T}})$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:mrow>\n                    <mml:msup>\n                      <mml:mi>L<\/mml:mi>\n                      <mml:mn>2<\/mml:mn>\n                    <\/mml:msup>\n                    <mml:mrow>\n                      <mml:mo>(<\/mml:mo>\n                      <mml:mi>T<\/mml:mi>\n                      <mml:mo>)<\/mml:mo>\n                    <\/mml:mrow>\n                    <mml:mo>\u2295<\/mml:mo>\n                    <mml:msup>\n                      <mml:mi>L<\/mml:mi>\n                      <mml:mn>2<\/mml:mn>\n                    <\/mml:msup>\n                    <mml:mrow>\n                      <mml:mo>(<\/mml:mo>\n                      <mml:mi>T<\/mml:mi>\n                      <mml:mo>)<\/mml:mo>\n                    <\/mml:mrow>\n                  <\/mml:mrow>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula> and, if their symbols are invertible in <jats:inline-formula><jats:alternatives><jats:tex-math>$$L^\\infty ({\\mathbb {T}})$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:mrow>\n                    <mml:msup>\n                      <mml:mi>L<\/mml:mi>\n                      <mml:mi>\u221e<\/mml:mi>\n                    <\/mml:msup>\n                    <mml:mrow>\n                      <mml:mo>(<\/mml:mo>\n                      <mml:mi>T<\/mml:mi>\n                      <mml:mo>)<\/mml:mo>\n                    <\/mml:mrow>\n                  <\/mml:mrow>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula>, to asymmetric truncated Toeplitz operators with the inverse symbol. Relations with Carleson\u2019s corona theorem are also established. These results are used to study the Fredholmness, the invertibility and the spectra of various classes of dual truncated Toeplitz operators.<\/jats:p>","DOI":"10.1007\/s43037-020-00077-8","type":"journal-article","created":{"date-parts":[[2020,6,16]],"date-time":"2020-06-16T13:03:43Z","timestamp":1592312623000},"page":"1558-1580","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Invertibility, Fredholmness and kernels of dual truncated Toeplitz operators"],"prefix":"10.1007","volume":"14","author":[{"given":"M. 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