sir acc to the explanation in rule 3 why we can't mention First(c) also contain null then First(A) ={b, c, null}. but an early explanation of rule 3 the set contain also null later mentions it contains null if both A and B contain null .confused please explain dear sir thanks .
We are trying to find all the possible terminals in the strings derived from A, where A -> BC ,and B and C end in some terminals. Now suppose that B turns out to be null, then the start for A will simply be the starting symbol for C, so in this case, the starting symbol for A just can not be null, since there is always starting symbol of C to show up if B turns out to be null, and ofc, if B is not null then A's start symbol will simply be B's start symbol, so we need not include null in A's start. But now consider the case in which both B and C are nullable, if both of them simultaneously become null then the value of A's start will be null, hence in this case we need to include null in start
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sir acc to the explanation in rule 3 why we can't mention First(c) also contain null then First(A) ={b, c, null}. but an early explanation of rule 3 the set contain also null later mentions it contains null if both A and B contain null .confused please explain dear sir thanks .
We are trying to find all the possible terminals in the strings derived from A, where A -> BC ,and B and C end in some terminals. Now suppose that B turns out to be null, then the start for A will simply be the starting symbol for C, so in this case, the starting symbol for A just can not be null, since there is always starting symbol of C to show up if B turns out to be null, and ofc, if B is not null then A's start symbol will simply be B's start symbol, so we need not include null in A's start. But now consider the case in which both B and C are nullable, if both of them simultaneously become null then the value of A's start will be null, hence in this case we need to include null in start
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3rd rule me confuse kar diya