Irrational number number to ratios of continuous magnitude. In his commentary on Book 10 of the "Elements", the Persian mathematician Al-Mahani (d. 874/884) examined and classified quadratic irrationals and cubic irrationals. He provided definitions for rational and irrational magnitudes, which he treated as irrational numbers. He dealt with them freely but explains them in geometric terms as follows: In contrast to Euclid's concept of magnitudes as lines, Al-Mahani considered integers and fractions as rational magnitudes, and square roots and cube roots as irrational magnitudes. He also introduced an arithmetical approach to the concept of irrationality, as he attributes the following to irrational
Fear Is the Key Fear Is the Key Fear Is the Key is a 1961 first-person narrative thriller novel by Scottish author Alistair MacLean. In the prologue, set in May 1958, John Talbot, owner of Trans Carib Air Charter Co is at an airfield in British Honduras, awaiting radio contact with one of his aircraft en route to Tampa, Florida. Not long after establishing contact the aircraft is attacked by a P-51 Mustang, after which all contact is lost. Two years later, Talbot is on trial for robbing a bank. At a point where his guilt is in doubt, new information comes to light