1, overview?

Sufficient conditions will certainly ensure the emergence of results.

2. definition?

Where there are things, there must be things; If there is no case A but not necessarily no case B, then A is a sufficient and unnecessary condition of B, which is called sufficient condition for short. Simply put, to satisfy A, it must be B; If A is not satisfied, it is not necessarily B, then A is a sufficient condition for B..

For example:

1, a rain; The ground is wet.

2. A handful of firewood; B will produce carbon dioxide.

In an example, a is a sufficient condition for b. To be exact, A is a necessary and sufficient condition for B;

First, A will inevitably lead to B;

Second, A is not a necessary condition for B to occur.

Second, the necessary conditions?

1, overview?

If there is no situation A, there must be no situation B; If there is something, there is not necessarily something, then A is the necessary and sufficient condition of B, referred to as the necessary condition.

2. definition?

Simply put, if you don't meet A, you won't meet B; Satisfying a does not necessarily mean b, then a is a necessary condition for B.

For example:

1. Keep breathing; B people can live

2.a knows 26 letters; B can read English.

3. One has heard of Peking Opera; B can appreciate the beauty of Beijing opera.

In the example, A is a necessary condition for B, to be exact, A is a necessary but not sufficient condition for B;

First, A is a necessary condition for B to occur;

Second, A does not necessarily lead to B.