Algebra (from Arabic al-jebr meaning "reunion of broken parts") is one of the broad parts of mathematics, together with number theory, geometry and analysis. In its most general form algebra is the study of symbols and the rules for manipulating symbols and is a unifying thread of almost all of mathematics. As such, it includes everything from elementary equation solving to the study of abstractions such as groups, rings, and fields. The more basic parts of algebra are called elementary algebra, the more abstract parts are called abstract algebra or modern algebra. Elementary algebra is essential...

"Alga" redirects here. For places called Alga, see Alga (disambiguation). For other uses, see Algae (disambiguation). Algae (/ˈældʒiː/ or /ˈælɡiː/; singular alga /ˈælɡə/, Latin for "seaweed") are a very large and diverse group of eukaryotic organisms, ranging from unicellular genera such as Chlorella and the diatoms to multicellular forms such as the giant kelp, a large brown alga that may grow up to 50 meters in length. Most are autotrophic and lack many of the distinct cell and tissue types found in land plants such as stomata, xylem and phloem. The largest and most complex marine algae are...

Bra may refer to: Brassiere, commonly referred to as a bra, a woman's undergarment that supports her breasts Bra cheese, a style of cheese from the Italian commune Bra–ket notation, a standard notation for describing quantum states, composed of angle brackets and vertical bars Front-end bra, a vinyl cover for a front vehicle bumper to prevent damage from road debris Male bra (also known as a compression bra, compression vest, gynecomastia vest, manssiere, or "bro"), a brassiere for men. == Places == in Italy: Bra, Piedmont, a commune in the Province of Cuneo, Piedmont Piazza Bra, a piazza in Verona...