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What is Lao Lu's formula, unless otherwise indicated?
Unless it is p, it is not Q. Logical relation: relation: -(-Q) deducts P, that is, Q deducts P.

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.

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