At page 21 of this book: https://cs.au.dk/~amoeller/spa/spa.pdf I found this:
I started reading everything and understanding it pretty well, until this.
It’s defining the possible types of a language. I’m very confused about what theta and alpha mean. What are those meta-variables? What is
Could someone give me some context? I’m not into computer science, this may be something specific that I have never seen before. I’m from a math background.
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