Sufficient condition

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Mathematical Logic life examples Edit this paragraph in life, common life "if ...... then ......" "if ......, you ......" and "as long as ......, on ...... "to indicate sufficient condition. For example: 1. If you draw with the game, then the Chinese soccer team will be able to qualify. 2. General Staff Command: If the aircraft can not land directly parachute Wenchuan. 3. Sishen asked Xianglinsao actually willing to follow, Wei old woman said: "Is there anything by failing. Trouble who is also always a bustling downtown of; just use the rope bundle, plug in the sedan, the carried to the groom, flick on Corolla, weddings, closing the door, get away. "But life associated with the use of these words are often not considered when people need. In other words, to meet the A, B bound up, we say, if A, then B, or if A, then B. This expresses the condition of adequacy, as condition A is not the result of B we have not considered necessary. For example: If you are alive, I'm going to write. From an objective point of view, does not meet the "alive" inevitably "can not write." Therefore, the "live" is the "I want to write," the necessary and sufficient conditions. But in fact the speaker was saying these words, he just wanted to express to meet the "I'm alive" when the inevitable "I want to write." As for the "can not live without writing," although we all know the situation, but not to express the speaker's meaning. So life associated words are merely expressions of these conditions is sufficient, adequate mean,nike mercurial cristiano ronaldo 2013, without considering the necessity and logic of this strict definition is different. Sufficient condition other saying: adequate conditions, adequate conditions, adequate conditions. Edit this section are defined logic: If there is something the case A, then there must be something situations B; case A if no things and not necessarily something no circumstances B, A is B is full and unnecessary conditions, referred to as sufficient. Sufficient condition for the study of logic and Hypothetical Hypothetical reasoning leads to. Representation of a thing is that another case of things sufficient conditions sufficient condition called Hypothetical Hypothetical Proposition. Adequate Condition proposition is the general form: If p, then q. Symbols: p → q (read as "p implication in q"). For example, "If the object is not external forces, then it will remain at rest or uniform motion" is a sufficient condition for the Hypothetical Proposition. According to Proposition sufficient condition false reasoning logical nature sufficient condition called Hypothetical reasoning. Edit this paragraph are mathematical proposition p, q, if p launched q, then p is a sufficient condition q, q is a necessary condition of p; if p and q Release Release q p, q,mercurial, then p is a necessary and sufficient condition, Short necessary and sufficient condition For example: x = y Release x ^ 2 = y ^ 2, then x = y is x ^ 2 = y ^ 2 a sufficient condition, x ^ 2 = y ^ 2 is a necessary condition x = y. a, b one positive and one negative launched ab <0, ab <0 launch a, b one positive and one negative, then a, b one positive and one negative and ab <0 mutually necessary and sufficient conditions. Edit this paragraph Example 1. A = "rain"; B = "ground moist." 2. A = "wood"; B = "will produce CO2". Example, the A sufficient condition is B, or rather, A is B, and unnecessary conditions sufficient: First, A will inevitably lead to B; Second, A is not required for B occurs. In the example, rain causes the ground moist, but not wet ground caused by the rain, may be a result of the splashing; wood will produce CO2, but the combustion to CO2 may be methanol. These instructions A is not B occurs required. So A is a sufficient condition for B, but also unnecessary conditions, namely unnecessary and sufficient conditions.