Decomposition of natural number
126354
Find all positive integers $a, b, c$ such that $1/a + 1/b + 1/c = 4/3999$
24582
Is the set of sequences of natural numbers with trailing zeros countable?
78847
Bijection between Prime numbers and Natural numbers
4530
For which natural numbers are $\phi(n)=2$?
36139
Size of a natural transformation and the Yoneda Lemma
130149
Computablility of a real number
46036
Logic for decomposing a permutation into different products composed of transpositions
142008
Find all natural numbers $n$ such that ${(n+1)}^{1/2}-{(n-1)}^{1/2}$ is rational
105623
Prime factorization knowing n and Euler's function
108922
Cardinality and infinite sets: naturals, integers, rationals, bijections
119486
Upper and Lower bounds on the nth prime number
148239
natural deduction proof with De Morgan's laws
52682
Is the power set of the natural numbers countable?
156660
The set of all strictly increasing sequences of natural numbers
104871
Direct cut-elimination for natural deduction.
79407
How to solve ~(P → Q) : P & ~Q by natural deduction?
141298
Image of the set of natural numbers under any function is denumerable.