Ludwig Wittgenstein was a close friend of Frank Ramsey. They met at Cambridge University in 1911, and their friendship lasted until Ramsey's death in 1930. They shared a love of mathematics and philosophy, and they often discussed their ideas with each other. Wittgenstein was greatly influenced by Ramsey's work, and he often cited him in his own writings.
The Extraordinary Mind of Frank Ramsey: A Quiz on the Renowned Mathematician, Philosopher, and Economist