For example, "You have no right to vote unless you are 18 years old". The right to vote → 18 years old. That is to say, "non-q unless p" can be translated into "Q→P"
A meaningful expression that connects relational expressions or logical quantities with logical operators is called a logical expression.
The value of a logical expression is a logical value, that is, "true" or "false". C language compiler system uses the number 1 to indicate "true" and the number 0 to indicate "false" when giving the logical operation result, but when judging whether a quantity is "true", it uses 0 to indicate "false" and non-0 to indicate "true".
No unless there is such a logical relationship:
1, unless a, b relationship -B deduction A. Unless you buy me a diamond ring, I will marry you. Not to marry you and buy a diamond ring.
2, unless A, it doesn't matter-(-B) Push A, that is, B pushes A ... I won't marry you unless you buy me a diamond ring. Marry you and buy a diamond ring.
3. Unless it is P, it is not Q. For example, we can give an example of getting married. I won't marry my daughter to you unless you give me 500 thousand.
Lao Lu took the postgraduate entrance examination in Lv Jiangang, and Lao Lu took the postgraduate entrance examination in the official account of Lv Jiangang, and was a master of science popularization; Editor-in-chief of Lao Lu logic, Lao Lu mathematics and Lao Lu writing series, and well-known educational bloggers have made educational videos from the media; Lao Lu participated in the postgraduate entrance examination of Lv Jiangang's homepage, trends, videos, columns, channels, collections and subscriptions.