Description of necessary conditions
If you want to achieve a certain result, you must have the necessary conditions, but you can certainly achieve this result without these necessary conditions. Only with the necessary conditions can we achieve the expected results. If you have sufficient conditions, you can completely achieve the results you want, and some of these sufficient conditions are necessary to achieve the results.
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Is large-scale to small-scale a sufficient and unnecessary condition or a necessary and insufficient condition?
Large-scale to small-scale is a sufficient condition, not a necessary condition. If there is material affection B, there must be material affection A; There is a thing situation A, but not necessarily a thing situation B. A is the necessary and sufficient condition of B. B is the necessary and sufficient condition of A. If A can deduce B, then A is the sufficient condition of B. Where A is a subset of B, that is, what belongs to A must belong to B, but what belongs to B does not necessarily belong to A. Specifically, if an element belongs to B but does not belong to A, A is the proper subset of B; If what belongs to B also belongs to A, A and B are equal. The necessary condition is the inverse of the sufficient condition. Suppose A is a condition, B is a conclusion (1) and A is a necessary and sufficient condition of B. If A can deduce B and B can deduce A (A=B)(2) A can deduce B from A, and B cannot deduce A, then A is a necessary and sufficient condition of B (A? B)(3) If B cannot be derived from A and A can be derived from B, then A is a necessary and sufficient condition for B (B? A)(4) If B cannot be inferred from A and A cannot be inferred from B, then A is an insufficient and unnecessary condition cited by B (A￠B and B￠A):
Baidu encyclopedia-completely unnecessary conditions
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Is large-scale to small-scale a sufficient and unnecessary condition or a necessary and insufficient condition?
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