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References to 'parent node (in a tree)'
1. alternating group has index 2 in the symmetric group, the by yesitis
2. alternative proof of the fundamental theorem of calculus by ruffa
3. approximating algebraic numbers with linear recurrences by rspuzio
4. determination of even abundant numbers with one odd prime factor by rspuzio
5. Leopold Kronecker by Mravinci
6. local dimension of a locally Euclidean space by joking
7. monoid bialgebra is a Hopf algebra if and only if monoid is a group by joking
8. more on division in groups by CWoo
9. N\'eron-Severi group by alozano
10. proof of bounds for e by rspuzio
11. proof of infinite product of sums $1\!+\!a_i$ result without exponentials by rspuzio
12. proof of uniqueness of center of a circle by CWoo
13. quantum chromodynamics (QCD) by bci1
14. shift operators in $\ell^p$ by matte
15. Stanis\l{}aw Ulam by PrimeFan
16. things counted by the Catalan numbers by rm50
17. tree by Logan