Introduction to string field theory
W. Siegel (C.N. Yang Institute for Theoretical Physics)

TL;DR
This paper provides an accessible introduction to string field theory, covering fundamental concepts and developments in the field for new learners and researchers.
Contribution
It offers a comprehensive overview of string field theory, including historical context, key ideas, and recent progress, serving as an educational resource.
Findings
Clarifies core principles of string field theory
Summarizes recent theoretical advancements
Provides educational material for newcomers
Abstract
The 1988 book, now free, with corrections and bookmarks (for pdf).
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