Argentine tea culture emigrated to Argentina seeking cultural freedom during a time in the 19th century when the Welsh language was suppressed in Great Britain. The Welsh tea customs are similar to those practised throughout Great Britain and Ireland, with tea being served at approximately 4:00 p.m., the tea beverage being mixed with milk and sugar and consumed alongside cakes and pastries. A combination of British tea culture and Argentine cuisine can be found in some establishments in Buenos Aires, where tea is served in the late afternoon following the British custom. Traditional British tea varieties such as Earl Grey are served with
19th century in science later in the 19th century by the German mathematician Bernhard Riemann; here no parallel can be found and the angles in a triangle add up to more than 180°. Riemann also developed Riemannian geometry, which unifies and vastly generalizes the three types of geometry. The 19th century saw the beginning of a great deal of abstract algebra. Hermann Grassmann in Germany gave a first version of vector spaces, William Rowan Hamilton in Ireland developed noncommutative algebra. The British mathematician George Boole devised an algebra that soon evolved into what is now called Boolean algebra, in which the only numbers were