Information: - A complex number is a number that can be expressed in the form , where and are real numbers and is the imaginary unit, satisfying the equation . In this expression, is the ' and is the ' of the complex number. If formula_1, then formula_2 - Mathematics (from Greek "mathma", knowledge, study, learning) is the study of topics such as quantity (numbers), structure, space, and change. There is a range of views among mathematicians and philosophers as to the exact scope and definition of mathematics. - In mathematics, the complex plane or "z"-plane is a geometric representation of the complex numbers established by the real axis and the perpendicular imaginary axis. It can be thought of as a modified Cartesian plane, with the real part of a complex number represented by a displacement along the x-axis, and the imaginary part by a displacement along the y-axis. - A definition is a statement of the meaning of a term (a word, phrase, or other set of symbols). Definitions can be classified into two large categories, intensional definitions (which try to give the essence of a term) and extensional definitions (which proceed by listing the objects that a term describes). Another important category of definitions is the class of ostensive definitions, which convey the meaning of a term by pointing out examples. A term may have many different senses and multiple meanings, and thus require multiple definitions. - In mathematics , arg is a function operating on complex numbers ( visualized in a complex plane ) . It gives the angle between the positive real axis to the line joining the point to the origin , shown as in figure 1 , known as an argument of the point . - In mathematics, a real number is a value that represents a quantity along a line. The adjective "real" in this context was introduced in the 17th century by Rene Descartes, who distinguished between real and imaginary roots of polynomials. After reading the paragraphs above, we are interested in knowing the entity with which 'argument ' exhibits the relationship of 'codomain'. Find the answer from the choices below. Choices: - class - complex number - real number
real number

Information: - Django Bates (born 2 October 1960) is a British composer, multi-instrumentalist and band leader. He plays the piano, keyboards and the tenor horn. He writes large-scale compositions on commission. - Mark Lockheart ( born Lymington , 1961 ) is a British jazz tenor saxophonist who came to prominence as a member of the Loose Tubes big band during the 1980s . - Loose Tubes was a British jazz big band/orchestra active during the mid-to-late 1980s. Critically and popularly acclaimed, the band was considered to be the focal point of a 1980s renaissance in British jazz (alongside The Jazz Warriors). It was the main launchpad for the careers of many future leading British jazz players including Django Bates, Iain Ballamy, Eddie Parker, Julian and Steve Arguelles, Mark Lockheart, Steve Berry, Tim Whitehead, Ashley Slater. In 2014 the band reformed to celebrate the 30th anniversary of the band's formation, with concerts at the Cheltenham Jazz Festival, Brecon Jazz Festival and a sold out week at Ronnie Scott's. - Iain Ballamy (born 20 February 1964) is a British composer, soprano, alto and tenor saxophone player. - Ashley Slater is a Canadian-born American trombone player and best known for his work with Norman Cook (a.k.a. Fatboy Slim) in the band Freak Power. - An orchestra is a large instrumental ensemble typical of classical music, which features string instruments such as violin, viola, cello and double bass, as well as brass, woodwinds, and percussion instruments, grouped in sections. Other instruments such as the piano and celesta may sometimes appear in a fifth keyboard section or may stand alone, as may the concert harp and, for performances of some modern compositions, electronic instruments. After reading the paragraphs above, we are interested in knowing the entity with which 'mark lockheart' exhibits the relationship of 'instrument'. Find the answer from the choices below. Choices: - celesta - cello - double bass - harp - horn - piano - saxophone - trombone - violin
saxophone