1. grammar G (Z): Z-> aZb | ab definition of what kind of language?
2. Write grammar quaternion form materials 22 pages identifiers in example 2.2.
3. Write the following expressions leftmost derivation and rightmost derivation syntax tree.
G (E):
E=> E + T | T
T=>T * F | F
F=>（E）| i
- i*i+i
- i+i*i
- i+(i+i)
Observe different leftmost and rightmost derivation process, as well as the similarities and differences of the syntax tree.
1.
Rules, also known as rewrite rules, production or formula
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3.
