Envy (apple) Envy (apple) Envy is a trademarked brand of the Scilate apple variety. Scilate is the result of a cross between Royal Gala and Braeburn. It was developed in New Zealand by HortResearch, submitted for a patent in 2008 and patented in 2009. Distribution of the Envy apple in North America began in 2009 through the Oppenheimer Group, and ENZA (The New Zealand Apple and Pear Marketing Board) began small commercial volumes in 2012 in Washington State. In Washington, the fruit surpassed 100,000 cartons for production in 2014. The companies anticipate harvesting 2 million cartons of the fruit by 2020. Envy
History of type theory History of type theory The type theory was initially created to avoid paradoxes in a variety of formal logics and rewrite systems. Later, type theory referred to a class of formal systems, some of which can serve as alternatives to naive set theory as a foundation for all mathematics. It has been tied to formal mathematics since "Principia Mathematica" to today's proof assistants. In a letter to Gottlob Frege (1902) Russell announced his discovery of the paradox in Frege's Begriffsschrift. Frege promptly responded, acknowledging the problem and proposing a solution in a technical discussion of "levels". To quote Frege: Incidentally,