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References to 'neighborhood (of a vertex)'
1. alternate proof of Mantel's theorem by lieven
2. bipartite matching by mathcam
3. derivation of integral representations of Jacobi $\vartheta$ functions by rspuzio
4. Hessian and inflexion points by rspuzio
5. Lagrange multipliers on manifolds by stevecheng
6. locally trivial bundle by mps
7. partial derivative by Mathprof