### Some articles on *petzval*:

Field Flattener Lens

... Field flattener lenses counteract the

... Field flattener lenses counteract the

**Petzval**field curvature of an optical system ... create a lens that shifts the focal points of the**Petzval**surface to lie in the same plane ... is given by the radius of curvature of the**Petzval**surface ...Joseph

...

**Petzval**- Life...

**Petzval**attended elementary school in Kežmarok, and began his secondary school studies in Kežmarok and Pudlein ... One anecdote told about**Petzval**is as follows When his family had already decided to make a shoemaker out of**Petzval**, he read the book Analytic Paper on the Elements of Mathematics ... After**Petzval**finished the book, the child who had been a weak math pupil swiftly became a math genius ...**Petzval**Lens

... The Petzval lens was developed in 1840 by Joseph Petzval ... It consisted of two doublet lenses with an aperture stop in between ...

Joseph

... Joseph

**Petzval**... Joseph

**Petzval**(German Josef Maximilian**Petzval**Hungarian Petzvál József Miksa Slovak Jozef Maximilián**Petzval**(January 6, 1807, Zipser Bela, Kingdom of Hungary (it was in Hungary when**Petzval**was born ...**Petzval**studied and later lectured at the Institutum Geometricum (currently Budapest University of Technology and Economics) in Buda (today part of Budapest) ...**Petzval**became a member of the Hungarian Academy of Sciences in 1873 ...Joseph

... In mathematics,

**Petzval**- Discoveries and Inventions - Mathematics... In mathematics,

**Petzval**stressed practical applicability ... Arguably it could be called the "**Petzval**transformation", since he was the first to study it and its applications in usual linear differential equations systematically ...**Petzval**wrote a paper in two volumes as well as a long work on this subject ...