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9 lines
490 B
9 lines
490 B
\node[] (i0j1) at (-1, 1) {A};
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\node[] (i1j1) at (1, 1) {B};
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\node[] (i0j0) at (-1, -1) {B};
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\node[] (i1j0) at (1, -1) {B};
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\draw[<-] (i0j0) -- (i0j1) node [midway] {$\mathrm{equiv}$} node [midway, above, rotate=-90] {$\sim$};
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\draw[->] (i0j0) -- (i1j0) node [midway, below] {$B$};
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\draw[->,dashed] (i0j1) -- (i1j1) node [midway] {};
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\draw[<-] (i1j0) -- (i1j1) node [midway, right] {$\mathrm{id}_B$} node [midway, above, rotate=90] {$\sim$};
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