Denotational semantics

Denotational semantics
http://users.monash.edu/~lloyd/tilde/Semantics/
http://pages.cs.wisc.edu/~horwitz/CS704-NOTES/6.DENOTATIONAL-SEMANTICS.html

https://www.cl.cam.ac.uk/~gw104/dens.pdf
https://www.cl.cam.ac.uk/teaching/0809/Semantics/notes-mono.pdf

Semantics of Programming Languages
https://www21.in.tum.de/~nipkow/semantics/

Difference Between Syntax and Semantics
https://techdifferences.com/difference-between-syntax-and-semantics.html