Edward Cocker was an English

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

 engraver, who also taught writing and arithmetic

Arithmetic

Arithmetic or arithmetics is the oldest and most elementary branch of mathematics, used by almost everyone, for tasks ranging from simple day-to-day counting to advanced science and business calculations. It involves the study of quantity, especially as the result of combining numbers...

.

Cocker was the reputed author of the famous Arithmetick, the popularity of which has added a phrase ("according to Cocker") to the list of English proverbialisms. He is credited with the authorship and execution of some fourteen sets of copy slips, one of which, Daniel's Copy-Book, ingraven by Edward Cocker, Philomath (1664), is preserved in the British Museum

British Museum

The British Museum is a museum of human history and culture in London. Its collections, which number more than seven million objects, are amongst the largest and most comprehensive in the world and originate from all continents, illustrating and documenting the story of human culture from its...

. Samuel Pepys

Samuel Pepys

Samuel Pepys FRS, MP, JP, was an English naval administrator and Member of Parliament who is now most famous for the diary he kept for a decade while still a relatively young man...

, in his Diary, makes very favourable mention of Cocker, who appears to have displayed great skill in his art.

Cocker's Arithmetick

Cocker's Arithmetick

Cocker's Arithmetick: Being a Plain and Familiar Method Suitable to the Meanest Capacity for the Full Understanding of That Incomparable Art, As It Is Now Taught by the Ablest School-Masters in City and Country is a grammar school mathematics textbook written by Edward Cocker and published...

, the fifty-second edition of which appeared in 1748, and which passed through over 100 editions in all, was not published during the lifetime of its reputed author, the first impression being dated 1678. Augustus de Morgan

Augustus De Morgan

Augustus De Morgan was a British mathematician and logician. He formulated De Morgan's laws and introduced the term mathematical induction, making its idea rigorous. The crater De Morgan on the Moon is named after him....

 in his Arithmetical Books (1847) argues that the work was a forgery of the editor and publisher, John Hawkins. Ruth Wallis, in 1997, wrote an article in Annals of Science

Annals of Science

Annals of Science is a peer-reviewed academic journal covering the history of science and technology. It is published by Taylor & Francis and was established in 1936...

, claiming DeMorgan's analysis was flawed and Cocker was the real author.