Text: because of this work dirichlet is considered the founder of the theory of fourier series. riemann , who was a student of dirichlet, wrote in the introduction to his habilitation thesis on fourier series that it was dirichlet :

Correct capitalization: Because of this work Dirichlet is considered the founder of the theory of Fourier series. Riemann , who was a student of Dirichlet, wrote in the introduction to his habilitation thesis on Fourier series that it was Dirichlet :

Text: the adidas super sport bag imported zipper is an excellent equipment for boxing.

Correct capitalization: The adidas Super sport bag Imported Zipper is an excellent equipment for boxing.

Text: yacon is known under the scientific name smallanthus sonchifolius but are also often refrerred to as polymnia sonchifolia.

Correct capitalization: Yacon is known under the scientific name Smallanthus sonchifolius but are also often refrerred to as Polymnia sonchifolia.

Text: there's an art to driving a truck.

Correct capitalization:
There's an art to driving a truck.