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...ure". He used coordinates initially introduced by [[Christoph Gudermann]] (1830) for spherical geometry, which were adapted by Escherich using [[hyperbolic [[Category:1849 births]] ...

...is Mazzari (editors). ''American Turkish Encounters: Politics and Culture, 1830-1989'' ([[EBSCO Information Services|EBSCO]] Ebook Academic Collection), Ca [[Category:1832 births]] ...

...rlanguage link|Louis Bourdon|fr}}, followed by ''Elements of Arithmetic'' (1830),{{sfn|De Morgan|1840a}} a widely used ...a]]. First expressed by [[George Peacock]] in his ''Treatise on Algebra'' (1830) and developed by [[Duncan Gregory]], symbolical algebra was a first step t ...

|1=[[Gymnosperm]]s [[File:PIH 1830 Scots Pine (Pinus sylvestris) graft clone collection in Röykkä Finland.jpg| ...s are often used as memorials, gifts and to mark special occasions such as births, deaths, weddings and holidays. Flower arrangements may be used to send [[L ...