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rouleau    音标拼音: [rul'o]
n. 卷轴,卷封的货币

卷轴,卷封的货币

rouleau
n 1: a roll of ribbon
2: a roll of coins wrapped in paper

Rouleau \Rou`leau"\, n.; pl. F. {Rouleaux} (F. ?; E. ?), E.
{Rouleaus}. [F., a roll, dim. fr. fr. r[^o]le, formerly also
spelt roulle. See {Roll}.]
A little roll; a roll of coins put up in paper, or something
resembling such a roll.
[1913 Webster]


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  • Difference between necessary and necessary but not sufficient . . .
    The bottom line is that once we can parse a given linguistic construction (case in point, the phrases necessary and sufficient) in symbolism, then we can also combine these with other known logical phrases, such as "not" and "and" Therefore, we can derive a logical interpretation of the phrase "necessary but not sufficient" (since in this
  • Necessary but not sufficient - Mathematics Stack Exchange
    Let's call the sentence "Q is necessary but not sufficient for P" R As for $(F,F)$ , if P is false when Q is also false, this should result in R = true; since Q is necessary for P, so the absence of Q should imply the absence of P
  • discrete mathematics - Necessary but not sufficient in logic . . .
    So, "being necessary for P" does not by itself imply " not being sufficiency" This is why " Q is necessary but not sufficient" says more than simply " Q is necessary" This is also why " Q is not sufficient" has to be added , via a conjunct The conjunct rules out the (T,T) case and the ( F,F) case
  • logic - What is the difference between necessary and sufficient . . .
    P is a sufficient for Q If P is true then Q will be always true (the first line in the table) Note that we do not consider the second line But as we see in the table Q can be true also when P is false (the third line in the table) So P is "just" a sufficient condition for Q Q is a necessary condition for P It is obvious from the table
  • logic - Sufficient but not Necessary conditions - Mathematics Stack . . .
    If it is divisible by 12 => it is divisible by 6 so that is sufficient I think maybe it's easy to confuse the meanings of nescessary and sufficient and intuitively necessary sound "stronger" than sufficient whereas sufficiency but not nescessary means too strong and nescessary but not sufficient means not strong enough I think a mental block
  • logic - sufficient condition vs necessary condition - Mathematics Stack . . .
    Being a sufficient or necessary condition is not an absolute property but a relative property A proposition is a sufficient or necessary condition for another proposition, not in and of itself So, saying "the first sentence is (or is not) a necessary condition" is meaningless, without saying for what it is (or it not) a necessary condition
  • Whats the different between necessary, sufficient, necessary and . . .
    To be a dessert is is necessary and sufficient to be a sweet food eaten after dinner Share Cite Follow
  • Can a Condition be neither Necessary nor Sufficient?
    For example, “weighing more than a ton is sufficient for being heavy” says the same as “anything that weighs more than a ton is heavy ” “P is a necessary condition forQ” means that something cannot possess the property Q if it does not possess the property P—in other words, something possesses the property Q only if it possesses
  • logic - Formulate necessary, but not sufficient, conditions for a . . .
    Would the Pythagorean theorem work as a necessary but not sufficient condition for example? Something like: $$ \sqrt[2]{a^2 + b^2} = c \Leftarrow Right\,\,Triangle $$ Though this would mean that there is a situation where the square of the sum of sides equals the square of the hypotenuse but the triangle is not a right triangle





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