Bertrand Arthur William Russell
The real world is often different from logical thinking. We perceive the reality through our five senses like eyes and nose. Then, we describe the logic. I am a Japanese, and we know that there is no Darth Vader in democratic society. He was the last shogunate. I mention it mathematically. Every shogunate is bald . (α) There is at least a shogunate in Japan even now. (β) There is at most a shogunate in Japan. (γ) Every shogunate is bald in Japan. x and y are variable. B(x) means the baldness. ∴ This is completely arbitrary. You see the baldness.