Discrete Mathematics Symmetric Diffirence Proof
67717
$A \oplus B = A \oplus C$ imply $B = C$?
103538
Partitions of $n$ into distinct odd and even parts proof
142534
Proof of $k {n\choose k} = n {n-1 \choose k-1}$ using direct proof
151038
How to prove (A v B), (A → C), (B → D) therefore (C v D)
105293
Proof of the second symmetric derivative
103854
Showing that $Q_n=D_n+D_{n-1}$
29828
Combinatorial proof of $\sum^{n}_{i=1}\binom{n}{i}i=n2^{n-1}$.
103106
Proving that any permutation in $S_n$ can be written as a product of disjoint cycles
74730
Combinatorial Proof of ${{n}\choose{k}} {{k}\choose{j}} = {{n}\choose{j}} {{n-j}\choose{k-j}}$
113119
Use the division algorithm to prove that 3|(n³ + 2n) for all n ∈ ℕ
28003
How to prove $A+ A^T$ symmetric, $A-A^T$ skew-symmetric.
12459
Associativity of symmetric difference of sets
31555
Divisor of $m$ and $n$ divides $m - qn$ (in proof of Euclidean algorithm)
154459
Constructing a HoTT proof term of 1≠0
121469
Proof of observations on natural numbers being expressed as differences of squares.
67927
Combinatorial argument for the identity $k\binom{n}{k} = n\binom{n-1}{k-1}$
5801
Combinatorial proof help