The phrase "a sort of introduction" is correct and usable in written English.
It can be used when you want to describe something that serves as an introductory element but may not be a formal or complete introduction.
Example: "This chapter serves as a sort of introduction to the main themes of the book."
Alternatives: "a kind of preface" or "a type of opening statement".
In the title essay, which serves as a sort of introduction to the collection, Achebe makes it clear that this is not a scholarly work, explaining that he missed his chance to be a scholar when, 40 years ago, "Trinity College, Cambridge turned down my application to study there after I took my first degree at the new University College, Ibadan".
It works as a sort of introduction to the elements of the movie and the world we've created, although the story of the short is completely different to the storyline in the eventual script.
That is, treat the first sentence as a sort of introduction and the last one as an a conclusion.
The use of arbitrary clauses without further requirements in logic programming is a motivation to pursue the same idea in proof-theoretic semantics, admitting just any sort of introduction rules and not just those of a special form, and in particular not necessarily ones which are well-founded.
Franzen kicks off with a sort of panoramic introduction to Walter and Patty Berglund as seen through the eyes of their neighbours in the gentrifying section of St Paul, Minnesota, where the couple have lived and raised their two children for close to 20 years.
Aside from that, the report it did provide a sort of "101" introduction to the service – although it was quite simplistic.
In Colorado, the conference acted as a sort of re-introduction to center stage of the Tea Party, which generated a strong following and great enthusiasm in 2010 but lost steam over ensuing years and has drawn some of the blame for the ongoing stumbling performance of the state's Republican party.
Like its first two showcases, these concerts bring together several ensembles, each to play a short set as a sort of appetite-whetting introduction to what it does; listeners can then keep tabs on the groups and catch full programs later in the season.
Welcome to the First Tuesday "club," a sort of hot-house introduction agency for anyone hoping to make a fortune from the new e-conomy in Europe.
