Compiler First Set


따라가다 보면 맨 왼쪽에 처음으로 등장하는 녀석

Suppose X is a nonterminal and X → $Y_1,Y_2...Y_k$
- if for some i, Y1...Yi-1 ⇒* ε , then First(X) ⊇ First(Yi) – {ε}
- if Y1...Yk ⇒* ε, then ε ∈ First(X)


> [결정적 구문 분석 - FIRST & FOLLOW (1)](https://m.blog.naver.com/PostView.naver?isHttpsRedirect=true&blogId=moonsoo5522&logNo=220716279651)

> [FIRST Set in Syntax Analysis - GeeksforGeeks](https://www.geeksforgeeks.org/first-set-in-syntax-analysis/)

> [Untitled](https://heaeat.github.io/first-follow/)






