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References to 'pullback'
1. $\Psi$ is surjective if and only if $\Psi^\ast$ is injective by matte
2. generalized Farkas lemma by stevecheng
3. invariant differential form by asteroid
4. Pfaff's problem by rspuzio
5. proof of criterion for conformal mapping of Riemannian spaces by rspuzio
6. Riemann surface by PrimeFan
7. tangent map by matte