First Command

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First[ <List L> ]
Gives a new list that contains the first element of the list L.
Example:
First[{1, 4, 3}] yields {1}.
Note: To get the first element use Element[{1, 4, 3}, 1].
First[ <List L>, <Number n of elements> ]
Gives a new list that contains just the first n elements of the list L.
Example:
First[{1, 4, 3}, 2] returns {1, 4}.
First[ <Text> ]
Gives first character of the text.
First[ <Text> , <Number n of elements> ]
Gives the first n characters of the text.
Example:
First["Hello",2] returns "He".
First[ <Locus>, <Number n of elements> ]
This command is useful for

CAS Syntax

First[ <List L> ]
Gives a new list that contains the first element of the list L.
Example:
First[{1, 4, 3}] yields {1}.
Note: To get the first element use Element[{1, 4, 3}, 1].
First[ <List L>, <Number n of elements> ]
Gives a new list that contains just the first n elements of the list L.
Example:
First[{1, 4, 3}, 2] returns {1, 4}.
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