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 Sep 30 awarded Popular Question Jan 25 asked How can I prove that “If $M$ is contractible differentiable manifold, then $M$ is orientable?” Jan 20 comment How calculate the De Rham cohomology group of $3$-torus: $T^3$? @user32240: thanks! Jan 20 comment How calculate the De Rham cohomology group of $3$-torus: $T^3$? Why $H^1(T^2 \times I)\rightarrow H^2(X)$ has a one dimensional image? Jan 20 comment How calculate the De Rham cohomology group of $3$-torus: $T^3$? i didn't how to use partition of unity? can you detail, please? But thanks you for answer. Jan 20 comment How calculate the De Rham cohomology group of $3$-torus: $T^3$? Yeah, Jason DeVito Jan 19 awarded Supporter Jan 19 awarded Custodian Jan 19 awarded Editor Jan 19 awarded Student Jan 19 revised How calculate the De Rham cohomology group of $3$-torus: $T^3$? added 53 characters in body Jan 19 reviewed Approve How calculate the De Rham cohomology group of $3$-torus: $T^3$? Jan 19 asked How calculate the De Rham cohomology group of $3$-torus: $T^3$?