Assume that the input conditions (logical variables) are A, B, C, D, and the output (logical function value) is F. Assume that the value of ABCDE is 0 or 1, where 0 stands for No and 1 stands for Yes.

And: when all four variables of ABCD are 1, the output f is 1, otherwise it is 0.

Or: when all four variables of ABCD are 0, the output f is 0, otherwise it is 1.

No: This logical operation is univariate, that is, there is only one conditional input.

Assuming that the input variable is a, if the value of a is 1, the output f is 0; If the value of a is 0, the output f is 1.

Note: or, and, nor and the following, nor, XOR, XOR can all use 1 and 0 to assign values to logical variables, construct truth tables (high school should talk about some basics), and vividly express the logical relationship between variables.

High school students learn the simplest logic, which belongs to the category of digital logic in universities. Students majoring in electronics, automation, computer and mathematics should learn this.