Graceful Tree Conjecture (Ringel–Kotzig conjecture)
Graceful Tree Conjecture (Ringel–Kotzig conjecture)
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Graceful Tree Conjecture (Ringel–Kotzig conjecture)
The Goormaghtigh conjecture
Gilbreath's conjecture
Gauss circle problem
Gap conjecture
Fuglede's conjecture in dimensions 1 and 2
Fortune's Conjecture
Convergence of the Flint Hills and Cookson Hills series
Firoozbakht's conjecture
Fibonacci Primes
Open questions about Fermat numbers
Feit-Thompson conjecture on primes
Falconer's distance set conjecture
Factorial primes
Exponentials conjectures and theorems
Euler's sum of powers conjecture
Open questions regarding the existence of Euler bricks
Euclid Numbers conjecture
The Erdős–Moser equation
Some conjectures about ranks of elliptic curves over ℚ
Elliott–Halberstam conjecture
Diophantine m -tuples
Dickson's conjecture
Babai–Seress Conjectures on the Diameter of Finite Groups
Determinantal conjecture