Gottfried Wilhelm Leibniz

Gottfried Wilhelm (von) Leibniz (/ˈlaɪbnɪts/;German: [ˈɡɔtfʁiːt ˈvɪlhɛlm fɔn ˈlaɪbnɪts] or [ˈlaɪpnɪts];French: Godefroi Guillaume Leibnitz; July 1, 1646 – November 14, 1716) was a German polymath and philosopher who occupies a prominent place in the history of mathematics and the history of philosophy. Scholars including Bertrand Russell believe Leibniz developed calculus independently of Isaac Newton, and Leibniz's notation has been widely used ever since it was published. It was only in the 20th century that his Law of Continuity and Transcendental Law of Homogeneity found mathematical implementation (by means of non-standard analysis). He became one of the most prolific inventors in the field of mechanical calculators. While working on adding automatic multiplication and division to Pascal's calculator, he was the first to describe a pinwheel calculator in 1685 and invented the Leibniz wheel, used in the arithmometer, the first mass-produced mechanical calculator. He also refined the binary number system, which is the foundation of virtually all digital computers.

William Lane Craig

William Lane Craig (/kreɪɡ/; born August 23, 1949) is an American Christian apologist, analytic Christian philosopher, and theologian. Craig's philosophical work focuses primarily on philosophy of religion, but also on metaphysics and philosophy of time. His theological interests are in historical Jesus studies and philosophical theology. He is known for his debates on the existence of God with public figures such as Christopher Hitchens and Lawrence Krauss.

Craig established an online apologetics ministry, ReasonableFaith.org. His current research deals with divine aseity and the challenge posed by Platonist accounts of abstract objects. Craig is also an author of several books, including Reasonable Faith, which began as a set of lectures for his apologetics classes.

Life and career

Craig is the second of three children born to Mallory and Doris Craig in Peoria, Illinois. His father's work with the T. P. & W. railroad took the family to Keokuk, Iowa, until his transfer to the home office in East Peoria in 1960. While a student at East Peoria Community High School (1963–67) Craig became a championship debater and public speaker, being named his senior year to the all-state debate team and winning the state championship in oratory. In September 1965, his junior year, he converted to Christianity, and after graduating from high school, attended Wheaton College, a Christian college, majoring in communications. Craig graduated in 1971 and the following year married his wife Jan, whom he met on the staff of Campus Crusade for Christ. In 2014, he was named alumnus of the year by Wheaton.

Isaac Newton

Sir Isaac Newton PRS (/ˈnjuːtən/; 25 December 1642 – 20 March 1726/27) was an English physicist and mathematician (described in his own day as a "natural philosopher") who is widely recognised as one of the most influential scientists of all time and as a key figure in the scientific revolution. His book Philosophiæ Naturalis Principia Mathematica ("Mathematical Principles of Natural Philosophy"), first published in 1687, laid the foundations for classical mechanics. Newton made seminal contributions to optics, and he shares credit with Gottfried Leibniz for the development of calculus.

Newton's Principia formulated the laws of motion and universal gravitation, which dominated scientists' view of the physical universe for the next three centuries. By deriving Kepler's laws of planetary motion from his mathematical description of gravity, and then using the same principles to account for the trajectories of comets, the tides, the precession of the equinoxes, and other phenomena, Newton removed the last doubts about the validity of the heliocentric model of the Solar System. This work also demonstrated that the motion of objects on Earth and of celestial bodies could be described by the same principles. His prediction that Earth should be shaped as an oblate spheroid was later vindicated by the measurements of Maupertuis, La Condamine, and others, which helped convince most Continental European scientists of the superiority of Newtonian mechanics over the earlier system of Descartes.