f***y
发帖数: 4447 | 1 Horner's method
https://en.wikipedia.org/wiki/Horner%27s_method
It is questionable to what extent it was De Morgan's advocacy of Horner's
priority in discovery[5][16] that led to "Horner's method" being so called
in textbooks, but it is true that those suggesting this tend themselves to
know of Horner largely through intermediaries, of whom De Morgan made
himself a prime example. However, this method qua method was known long
before Horner. In reverse chronological order, Horner's method was alr... 阅读全帖 |
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a*********3
发帖数: 660 | 2 定义 definition变量 variable面积 area直径 diameter半径 radius公式 formula
单价 unit price范围 range/scope/extent集合 set法则 principle本金 principal利
率 interest rate利息 interest单利 simple interest复利 compound interest正数
positive number负数 negative number解析式 analytic expression分类讨论
classified discussion性质 nature （不是很确定）奇函数 odd function偶函数
even function对称 symmetric坐标原点 origin单调性 monotonicity（不是很确定）
任意 random周期性 periodic 有界性 boundedness 数学 mathematics, maths(BrE)
, math(AmE) 公理 axiom 定理 theorem 计算 calculation 运算 operat... 阅读全帖 |
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a*********n
发帖数: 1331 | 3 外行，但要用到这个方法找“hot spots”，请问有简单的好用的软件吗？ |
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a*********n
发帖数: 1331 | 4 外行，但要用到这个方法找“hot spots”，请问有简单的好用的软件吗？ |
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a*********n
发帖数: 1331 | 5 外行，但要用到这个方法找“hot spots”，请问有简单的好用的软件吗？ |
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a*********n
发帖数: 1331 | 6 外行，但要用到这个方法找“hot spots”，请问有简单的好用的软件吗？ |
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d********g
发帖数: 39 | 7 如下从Kline的古今数学思想中copy下来。
说四次方程的求解呢就是替换之后将左右变形，使得左边成为一个平方式，右边是一
个二次式，然后假设右边二次式的判别式为零，于是babalala。但这个假设为何可以随
便做出呢？
success in solving the quartic. The method is due to Lodovico Ferrari and
was published in Cardan's Ars Magna; we dcscribe it in modern notation and
with literal coefficients to show thc gcnerality. The equation is
(18)
x 4 + bx 3 + cx 2 + dx + e = O.
By transposition we get
( 19)
x 4 + bx 3 = -cx 2 - dx - e.
Now complete the square on the lcft sidc by adding ( bx r. This givcs
(X2 + |
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I*S
发帖数: 203 | 8 Thanks for ur reply!
I just tried like u described, and finally encountered the quartic equation. |
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y****t
发帖数: 17 | 9 P23 chapter1 3.18 (b)怎么做？
Projectively Normal Varieties
A projective variety Y(P^n的子集） is projectively normal (with respect to
the given embending ) if its homogeneous coordinate ring S(Y) is
integrally closed.
(b)let Y be the twisted quartic curve in P^3 given parametrically by
(x,y,z,w)=(t^4,t^3*u,t*u^3,u^4). Then Y is normal but not projectively
normal.
thank you very much! |
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V****n
发帖数: 651 | 10 two real roots:
2.421245305
-1.133248531
I had an Excel program that can find the roots. You can find many online
small programs by just searching for "quartic equation". |
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a*********n
发帖数: 1331 | 11 外行，但要用到这个方法找“hot spots”，请问有简单的好用的软件吗？ |
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