Algebra & Re-arrangement
71918
Mathematical Induction
135408
Solving permutation problem sequentially.
28952
Sharing alignment between equations in two different items
41205
Help me solve a combinatorial problem
1405
Arrangements of a,a,a,b,b,b,c,c,c in which no three consecutive letters are the same
86394
EVERGREEN string question. Combinations and permutations
9118
Polynomial division: an obvious trick? [reducing mod $\textit{simpler}$ multiples]
110585
Rearranging infinite series
129653
Solving a polynomial with grouping
70894
Aligning equations, splitted in an enumeration
86915
side-by-side equations, with equation numbers for each
143541
Decomposition of an algebraic number into a sum or product of algebraic numbers with smaller degree
41726
Musical and combinatorial proof
133948
Shrinking or splitting some equations in a group of equations
61387
Incorrect Solution for Problem 7 of Pinter's Book of Abstract Algebra, Chapter 2?
138631
Overlapping Polynomials
60416
Finding a permutation, and number of, from powers of the permutation