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References to 'parallelogram principle'
1. $n$-torus by ack
2. closure of sets closed under a finitary operation by yark
3. common point of triangle medians by pahio
4. complexification of vector space by stevecheng
5. cross product by yark
6. difference of vectors by pahio
7. direct integral of Hilbert spaces by rspuzio
8. direct sum of Hilbert spaces by asteroid
9. Fr\'echet space by rmilson
10. Gauss--Lucas theorem by pahio
11. high school mathematics by matte
12. local minimum of convex function is necessarily global by stevecheng
13. Menelaus' theorem by mathwizard
14. proof of Ceva's theorem by yark
15. signature by CWoo
16. topics on vectors by perucho
17. topological vector space by yark
18. vector projection by pahio