Electromagnetic force has an infinite range of interaction. It is considerably stronger than the gravitational and weak forces. The photon is the key particle of exchange for electromagnetic force. The Strong Nuclear Force The strong nuclear force operates over a very short range, but it is the strongest of the forces.
Thomas Holmes and Richard Rahe are 2 now famous psychiatrists who, in 1967, put forward the idea that there may be a link to stress and physical illness.
The symbol for division, , called an obelus, was first used in 1659, by the Swiss mathematician Johann Heinrich Rahn in his work entitled Teutsche Algebr. The symbol was later introduced to London when the English mathematician Thomas Brancker translated Rahn s work (Cajori, A History of Mathematics, 140).