Hilary Putnam — American Philosopher born on July 31, 1926,

Hilary Whitehall Putnam is an American philosopher, mathematician, and computer scientist who has been a central figure in analytic philosophy since the 1960s, especially in philosophy of mind, philosophy of language, philosophy of mathematics, and philosophy of science. He is known for his willingness to apply an equal degree of scrutiny to his own philosophical positions as to those of others, subjecting each position to rigorous analysis until he exposes its flaws. As a result, he has acquired a reputation for frequently changing his own position. Putnam is currently Cogan University Professor Emeritus at Harvard University... (wikipedia)

No sane person should believe that something is subjective merely because it cannot be settled beyond controversy.
I think part of the appeal of mathematical logic is that the formulas look mysterious - You write backward Es!