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pi 音标拼音: [p'ɑɪ] n. 圆周率;混杂的铅字堆;混乱 圆周率;混杂的铅字堆;混乱 pi n 1: the ratio of the circumference to the diameter of a circle; approximately equal to 3. 14159265358979323846... 2: someone who can be employed as a detective to collect information [ synonym: { private detective}, { PI}, { private eye}, { private investigator}, { operative}, { shamus}, { sherlock}] 3: the scientist in charge of an experiment or research project [ synonym: { principal investigator}, { PI}] 4: the 16th letter of the Greek alphabet 5: an antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs [ synonym: { protease inhibitor}, { PI}] Pi \ Pi\ ( p[= e]` [ imac]"), n. ( Chem.) The inorganic orthophoshate ion; -- a symbol used in biochemistry. [ acronym] [ PJC]
Pi \ Pi\ ( p[ imac]), n. [ See { Pica}, { Pie} magpie, service- book.] ( Print.) A mass of type confusedly mixed or unsorted. [ Written also { pie}.] [ 1913 Webster]
Pi \ Pi\ ( p[ imac]), n. [ Gr. pi^.] 1. A Greek letter ([ Pi], [ pi]) corresponding to the Roman letter { P}. [ Webster 1913 Suppl.] 2. Specifically: ( Math.) The letter [ pi], [ Pi], as used to denote the number or quotient approximately expressing the ratio of the circumference of a circle to its diameter; also, the quotient or the ratio itself. The value of the quotient pi, to twenty decimal places, is 3. 14159265358979323846 ( see note). The number pi is an irrational number, i. e. it cannot be expressed as the quotient of two integers. It is also a transcendental number, i. e. it cannot be expressed as a root of an algebraic equation with a finite number of terms; and from this fact follows the impossibility of the quadrature of the circle by purely algebraic processes, or by the aid of a ruler and compass. [ Webster 1913 Suppl. PJC] Note: The first 1000 decimal digits of the number pi are as displayed below. The digits are arranged as five sets of ten digits per line in twenty lines, proceeding left to right in each line. 3. 1415926535 8979323846 2643383279 5028841971 6939937510 5820974944 5923078164 0628620899 8628034825 3421170679 8214808651 3282306647 0938446095 5058223172 5359408128 4811174502 8410270193 8521105559 6446229489 5493038196 4428810975 6659334461 2847564823 3786783165 2712019091 4564856692 3460348610 4543266482 1339360726 0249141273 7245870066 0631558817 4881520920 9628292540 9171536436 7892590360 0113305305 4882046652 1384146951 9415116094 3305727036 5759591953 0921861173 8193261179 3105118548 0744623799 6274956735 1885752724 8912279381 8301194912 9833673362 4406566430 8602139494 6395224737 1907021798 6094370277 0539217176 2931767523 8467481846 7669405132 0005681271 4526356082 7785771342 7577896091 7363717872 1468440901 2249534301 4654958537 1050792279 6892589235 4201995611 2129021960 8640344181 5981362977 4771309960 5187072113 4999999837 2978049951 0597317328 1609631859 5024459455 3469083026 4252230825 3344685035 2619311881 7101000313 7838752886 5875332083 8142061717 7669147303 5982534904 2875546873 1159562863 8823537875 9375195778 1857780532 1712268066 1300192787 6611195909 2164201989 [ Webster 1913 Suppl. PJC]
Pi \ Pi\, v. t. [ imp. & p. p. { Pied}; p. pr. & vb. n. { Pieing}.] ( Print.) To put into a mixed and disordered condition, as type; to mix and disarrange the type of; as, to pi a form. [ Written also { pie}.] [ 1913 Webster] 76 Moby Thesaurus words for " pi": ascender, back, ball up, bastard type, beard, belly, bevel, black letter, body, bollix up, cap, capital, case, compose, confound, confuse, counter, descender, em, en, face, fat- faced type, feet, font, foul up, fumble, garble, groove, impose, italic, jumble, justify, letter, ligature, logotype, lower case, majuscule, make up, minuscule, mix up, muck up, muddle, nick, overrun, pi a form, pica, play hob with, point, print, riffle, roman, sans serif, scramble, screw up, script, set, set in print, shank, shoulder, shuffle, small cap, small capital, snafu, snarl up, stamp, stem, tumble, type, type body, type class, type lice, typecase, typeface, typefounders, typefoundry, upper case |
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- π 是怎么算出来的? - 知乎
Archimedes pi (图片来源: Wikipedia) 可以看出,到了正八边形时,内接八边形与外切八边形之间的“间隙”比正方形的情况小了。此时 π 的估算值相对于正方形的情况会有一个精度上的提升。但是,现在的问题是:八边形的周长如何计算?而且就算把八边形的周长计算出来了,那16边形、32边形岂不是精度
- 圆周率pi比较著名的无穷级数公式有哪些? - 知乎
知乎,中文互联网高质量的问答社区和创作者聚集的原创内容平台,于 2011 年 1 月正式上线,以「让人们更好的分享知识、经验和见解,找到自己的解答」为品牌使命。知乎凭借认真、专业、友善的社区氛围、独特的产品机制以及结构化和易获得的优质内容,聚集了中文互联网科技、商业、影视
- π是如何定义的? - 知乎
然而, \mathbb R 上处处可导且严格凹的函数不可能有界, 由此产生矛盾 得知余弦函数必有实零点后, 因为余弦函数是偶函数, 而且这个零点不可能是 0, 所以必然会有一个正的零点 我们将这个零点的 2 倍定义为 \pi
- π这个符号怎么打出来? - 知乎
需要用到什么输入法呀很多输入法输入pai应该都能打出来,就是规范不规范的问题了,要打出来最标准的当然使用 Markdown语言 最好。 我之前总结过 Markdown语言 的用法,可以参考一下。
- 研究员为什么是principal investigator而不是researcher? - 知乎
简言之,PI是对所负责的项目有主导权和指导权的个体。 值得注意的是,根据国外同类机构的定义,只要是申请人获得了项目资助,就可以认为是该项目的PI,而不管其是助理教授、副教授还是教授,只要有足够的科研经费就可以招博士、博士后和科研技术人员
- 四青 哪个更难,侧重点有不同吗? - 知乎
四青 哪个更难,侧重点有不同吗? 青年千人、青年长江、青年拔尖、优秀青基。 以及什么条件才能从副教授或PI,开始学术生涯? 显示全部 关注者 406 被浏览
- atan2(x,y) 如何理解? - 知乎
详细信息 四象限反正切 四象限反正切 atan2(Y,X) 基于图形中所示的 Y 和 X 的值返回闭区间 [-pi,pi] 中的值。 相比之下,atan(Y X) 返回的结果仅限于区间 [-pi 2,pi 2],如图的右侧所示。 IEEE 合规性 对于实数输入,atan2 的一些行为不同于 IEEE®-754 标准中推荐的行为。
- DeepSeek的GRPO算法是什么? - 知乎
GRPO 是一种在线学习算法(online learning algorithm),这意味着它通过使用训练过程中由训练模型自身生成的数据来迭代改进。 GRPO 的目标直觉是最大化生成补全(completions)的优势函数(advantage),同时确保模型保持在参考策略(reference policy)附近。
- 压力单位PSI与Mpa之间怎么换算? - 知乎
知乎,中文互联网高质量的问答社区和创作者聚集的原创内容平台,于 2011 年 1 月正式上线,以「让人们更好的分享知识、经验和见解,找到自己的解答」为品牌使命。知乎凭借认真、专业、友善的社区氛围、独特的产品机制以及结构化和易获得的优质内容,聚集了中文互联网科技、商业、影视
- PID控制系统的比例增益和带宽的关系是怎样的呢? - 知乎
回到问题上,PID控制器,当控制系统的比例增益变大,如果看闭环bode图,幅频特性曲线会往上抬,带宽频率增大,有利于信号的跟踪,但可能对噪声敏感(噪声往往是高频的);看开环bode图,同样幅频特性曲线会往上抬,稳定裕度下降,可能不稳定。
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