What is the table header and footer for a generalized table?

The generalized table (A, B), the c,d, and the footer are respectively what the table headers and footers are.

Pro, most of the students encountered a generalized table on the pain, in fact, I want to say is: The world more than a little more than the broad table of people are living so happy, you have what not past.

take a look at my formula:

(1) Table header: When the generalized table LS is not empty, the first element is called LS's table head;

(2) footer: The rest of the elements are called the generalized table LS, after removing the table header Generalized Tables is the footer of LS.

Some students above (1) (2) Look too fast, did not find the difference between the table head and the footer.

focus on three times: The table header is an element, and the footer is a generalized table.

focus on three times: The table header is an element, and the footer is a generalized table.

focus on three times: The table header is an element, and the footer is a generalized table.

I'm going to give you a kiss.

the table header of a generalized table (A, (b)) is cell A, and the footer is a generalized table ((b)). "The pro wants to add a layer of parentheses to the outside (b) to become a generalized table." Therefore, it is ((b)) "

Kiss, I'm going to give you another one.

the table header of a generalized table (a) is cell A, the footer is a generalized table (), Wow, why is (), not empty. There is no element behind obviously a. Consider that the end of the table must be a generalized table. The subtext is a certain band (), there is no element there is a solitary () good.

Kiss, I'm going to give you another one.

the table header of a generalized table (a, B, c) is cell A, and the footer is a generalized table (B,C).

well, by now, you already know that the table header of a generalized table is a cell, and the footer is a generalized table.

　Summary Summary Summary : The definition of the header and footer according to the generalized table indicates:

(1) for any non-empty generalized table, its header may be either a cell or a generalized table,

(2) The end of the table must be a generalized table.

(3) Note the depth of the footer (that is, the number of nested layers of parentheses)

(4) The footer is a generalized table that consists of elements other than the table header, so you need to add a layer of parentheses outside the immediate element of the footer.

　

to verify how you are learning.

To find the table header and footer of generalized table is the basic operation of generalized table, given a generalized table, we can find out a single element through the table header and the footer of the table.

Known generalized table l= (A, (b, (c, (d)), E), F)

⑴l1=tail (L) = ((b, (c, (d)), E), F)

⑵l2=head (L1) = (b, (c, (d)), E)

⑶l3=tail (L2) = ((c, (d)), E)

⑷l4=head (L3) = (c, (d))

⑸l5=head (L4) = C

If all the above 5 are correct, then congratulations on your mastery of the head and tail of the generalized table.