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Effective Constructive Algebraic Topology - Institut Fourier

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Meaning:<br />

∂D 5 1 = S4 1<br />

X4<br />

X3<br />

D 5 1<br />

-2 -1 -4<br />

-1<br />

4<br />

6<br />

6<br />

4<br />

4<br />

D 4 1 D 4 2 D 4 3 · · ·<br />

· · ·<br />

19

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