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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. heap removal algorithm by mps
6. Leopold Kronecker by Mravinci
7. Liber Abaci by milogardner
8. monoid bialgebra is a Hopf algebra if and only if monoid is a group by joking
9. more on division in groups by CWoo
10. N\'eron-Severi group by alozano
11. proof of bounds for e by rspuzio
12. proof of infinite product of sums $1\!+\!a_i$ result without exponentials by rspuzio
13. proof of uniqueness of center of a circle by CWoo
14. quantum chromodynamics (QCD) by bci1
15. red-black tree by PrimeFan
16. regular open algebra by CWoo
17. rules of calculus for derivative of formal power series by rspuzio
18. shift operators in $\ell^p$ by matte
19. Stanis\l{}aw Ulam by PrimeFan
20. things counted by the Catalan numbers by rm50
21. tree by Logan
22. Why Study Egyptian Fraction Mathematics by milogardner