Information: - A mathematical problem is a problem that is amenable to being represented, analyzed, and possibly solved, with the methods of mathematics. This can be a real-world problem, such as computing the orbits of the planets in the solar system, or a problem of a more abstract nature, such as Hilbert's problems.<br> It can also be a problem referring to the nature of mathematics itself, such as Russell's Paradox. - Ivan Vidav ( January 17 , 1918 -- October 6 , 2015 ) was a Slovenian mathematician . Ivan Vidav was born in Opine near Trieste ( Slovenian Trst ) , Italy . He was Josip Plemelj 's student . Vidav got his Ph.D. under Plemelj 's advisory in 1941 at the University of Ljubljana with a dissertation Kleinovi teoremi v teoriji linearnih diferencialnih enab ( Klein 's theorems in the theory of linear differential equations ) . Vidav 's main research interest were differential equations , functional analysis and algebra . He was a regular member of Slovenian Academy of Sciences and Arts . He was awarded the Preseren Award . From 1988 he was an honourable member of the Society of Mathematicians , Physicists and Astronomers of Slovenia ( DMFA ) . - A mathematician is someone who uses an extensive knowledge of mathematics in his/her work, typically to solve mathematical problems. - 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. After reading the paragraphs above, we are interested in knowing the entity with which 'ivan vidav' exhibits the relationship of 'field of work'. Find the answer from the choices below. Choices: - mathematician - mathematics - nature
mathematics

Information: - Daniel Wu Yin-cho (jyutping: ng4 jin6zou2; born September 30, 1974) is a Hong Kong-American actor, director and producer, and as of 2015, starring as Sunny in the "AMC" martial arts drama series "Into the Badlands". Since his film debut in 1998, he has been featured in over 60 films. Wu has been called "the young Donnie Yen," and is known as a "flexible and distinctive" leading actor in the Chinese-language film industry. - A photographer (the Greek ("phos"), meaning "light", and ("graphe"), meaning "drawing, writing", together meaning "drawing with light") is a person who makes photographs. - Yonfan or Yang Fan (Manshih Yonfan; born 1947 in Wuhan, China) is a Taiwanese film director and photographer. - Bishonen ... ( Chinese : ; literally : Passion Between Beautiful Youths ) , is a 1998 Hong Kong romantic drama film about an ill - fated gay romance . Directed by Yonfan , it stars Stephen Fung , Daniel Wu and Shu Qi . In 2011 , the film was screened at the 16th Busan International Film Festival as part of a retrospective of Yonfan 's work , which featured seven of his restored and re-mastered films from the 1980s through the 2000s . - Jyutping is a romanisation system for Cantonese developed by the Linguistic Society of Hong Kong (LSHK), an academic group, in 1993. Its formal name is The Linguistic Society of Hong Kong Cantonese Romanisation Scheme. The LSHK promotes the use of this romanisation system. - Lin Li-hui (born 16 April 1976), better known by her stage name Shu Qi, is a Taiwanese actress and model. She has also been credited as Hsu Chi and Shu Kei (Cantonese pronunciation of "Shu Qi"). After reading the paragraphs above, we are interested in knowing the entity with which 'bishonen ' exhibits the relationship of 'original language of work'. Find the answer from the choices below. Choices: - cantonese - chinese - greek
cantonese