= Dan Israël
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<Dan Israël> developed a systematic teaching account of <string theory> that connects the <string worldsheet> with quantization and <conformal field theory>. His notes work from the classical string description toward the quantum consistency and interaction problems.<Lecture Notes on String Theory by Dan Israël>[Contents and chapters on worldsheet dynamics, quantization and conformal methods]{ref}
The distinction between worldsheet coordinates and target-spacetime coordinates is foundational: a field on the two-dimensional worldsheet can describe how a string is embedded in a higher-dimensional spacetime. The formulation separates the model's internal description from the space in which its physical excitations are interpreted.
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