B*e
6 楼
古哥说
log(55) = 1.74036269
http://www.google.com/search?hl=en&source=hp&biw=1275&bih=180&q
ln(55) = 4.00733319
http://www.google.com/search?hl=en&biw=1275&bih=180&q=ln%2855%2
log(55) = 1.74036269
http://www.google.com/search?hl=en&source=hp&biw=1275&bih=180&q
ln(55) = 4.00733319
http://www.google.com/search?hl=en&biw=1275&bih=180&q=ln%2855%2
n*n
9 楼
但是广大教科书基本默认log就是ln
【在 B********e 的大作中提到】![](/moin_static193/solenoid/img/up.png)
: 古哥说
: log(55) = 1.74036269
: http://www.google.com/search?hl=en&source=hp&biw=1275&bih=180&q
: ln(55) = 4.00733319
: http://www.google.com/search?hl=en&biw=1275&bih=180&q=ln%2855%2
【在 B********e 的大作中提到】
![](/moin_static193/solenoid/img/up.png)
: 古哥说
: log(55) = 1.74036269
: http://www.google.com/search?hl=en&source=hp&biw=1275&bih=180&q
: ln(55) = 4.00733319
: http://www.google.com/search?hl=en&biw=1275&bih=180&q=ln%2855%2
l*k
12 楼
前两天有人贴了个钟比这个学术
e*e
16 楼
好多看不懂的,6.9头上加一横怎么就是7?
n*a
18 楼
11点那个方向谁解释下?
M*n
28 楼
1是Legendre's constant, http://en.wikipedia.org/wiki/Legendre%27s_constant
3i是3的HTML code吧
2(-1)= x (mod7)是模反,就是2x = 1 (mod7), x = 4
(2phi -1)2, phi = 1.618... 黄金分割率
8是二进制的1000
11,0x0B不就是0B么,还是16进制
有包子没?
【在 h*n 的大作中提到】![](/moin_static193/solenoid/img/up.png)
: 晕,这个一半都不懂。
: 1,3,4,5,8,11怎么回事?0x0B为啥是11?
3i是3的HTML code吧
2(-1)= x (mod7)是模反,就是2x = 1 (mod7), x = 4
(2phi -1)2, phi = 1.618... 黄金分割率
8是二进制的1000
11,0x0B不就是0B么,还是16进制
有包子没?
【在 h*n 的大作中提到】
![](/moin_static193/solenoid/img/up.png)
: 晕,这个一半都不懂。
: 1,3,4,5,8,11怎么回事?0x0B为啥是11?
s*g
29 楼
I googled:
B'L : Legendre's Constant = 1
Sum(1/2i) : 1 + (1/2) + (1/4) + (1/8)... = 2
3 : HTML Character code for "3". is a prefix normally given for
these characters, the 'x33' means 33 base 16 (or 51 decimal). Note if you
type "3" into a Reddit comment you get "3" :)
2-1 (mod 7) : In normal modular arithmetic, subtract the "mod" from the
calculation until you get a number less than the "mod". So 15 mod 11 = 4. In
inverse modulo arithmetic, you're asking what number, when multiplied by 2,
equals 1 mod 7. 4 foots the bill = 2*4 = 8, 8-7 = 1.
*(2phi - 1)2** : phi is the Golden Ratio, the root of x2 - x - 1 = 0.
3! : 3*2*1 = 6
6.999.... : 7. Not "almost 7" - exactly 7, because 0.999... = 1.
xooo : Just binary - instead of counting 1's, 10's, 100's places, binary
goes 1, 2, 4, 8.... So "1000" in binary is 8 in decimal
21 (base 4) : same deal. Instead of 1/10/100, we have 1/4/16/64 in base 4.
So "21" is 2*4 + 1*1 = 9.
5 choose 2 : That's notation used in probability. With 5 items (say balls
numbered 1-5), there are 10 ways to pick two balls (1 and 2, 1 and 3... 4
and 5) (order doesn't matter).
0x0B : Another base conversion but base 16. But with 16>10, they had to make
up symbols for numbers. A-F was chosen for 10-15 (16 is just "10" in hex).
"B" corresponds to 11 in decimal.
Cube root of 1728 : Probably only remarkable because Ramanujan (the Indian
mathematician mentioned in the bar scene in Good Will Hunting) used this
number in a common anecdote about him.
edit: formatting and correction for #2. The chances of me getting this right
the first time was about 0.999 - 1 :)
B'L : Legendre's Constant = 1
Sum(1/2i) : 1 + (1/2) + (1/4) + (1/8)... = 2
3 : HTML Character code for "3". is a prefix normally given for
these characters, the 'x33' means 33 base 16 (or 51 decimal). Note if you
type "3" into a Reddit comment you get "3" :)
2-1 (mod 7) : In normal modular arithmetic, subtract the "mod" from the
calculation until you get a number less than the "mod". So 15 mod 11 = 4. In
inverse modulo arithmetic, you're asking what number, when multiplied by 2,
equals 1 mod 7. 4 foots the bill = 2*4 = 8, 8-7 = 1.
*(2phi - 1)2** : phi is the Golden Ratio, the root of x2 - x - 1 = 0.
3! : 3*2*1 = 6
6.999.... : 7. Not "almost 7" - exactly 7, because 0.999... = 1.
xooo : Just binary - instead of counting 1's, 10's, 100's places, binary
goes 1, 2, 4, 8.... So "1000" in binary is 8 in decimal
21 (base 4) : same deal. Instead of 1/10/100, we have 1/4/16/64 in base 4.
So "21" is 2*4 + 1*1 = 9.
5 choose 2 : That's notation used in probability. With 5 items (say balls
numbered 1-5), there are 10 ways to pick two balls (1 and 2, 1 and 3... 4
and 5) (order doesn't matter).
0x0B : Another base conversion but base 16. But with 16>10, they had to make
up symbols for numbers. A-F was chosen for 10-15 (16 is just "10" in hex).
"B" corresponds to 11 in decimal.
Cube root of 1728 : Probably only remarkable because Ramanujan (the Indian
mathematician mentioned in the bar scene in Good Will Hunting) used this
number in a common anecdote about him.
edit: formatting and correction for #2. The chances of me getting this right
the first time was about 0.999 - 1 :)
h*n
31 楼
我靠,居然忘了0x就代表16进制。。。还以为是乘号。这下都明白了,给你发个双黄包。
【在 M******n 的大作中提到】![](/moin_static193/solenoid/img/up.png)
: 1是Legendre's constant, http://en.wikipedia.org/wiki/Legendre%27s_constant
: 3i是3的HTML code吧
: 2(-1)= x (mod7)是模反,就是2x = 1 (mod7), x = 4
: (2phi -1)2, phi = 1.618... 黄金分割率
: 8是二进制的1000
: 11,0x0B不就是0B么,还是16进制
: 有包子没?
【在 M******n 的大作中提到】
![](/moin_static193/solenoid/img/up.png)
: 1是Legendre's constant, http://en.wikipedia.org/wiki/Legendre%27s_constant
: 3i是3的HTML code吧
: 2(-1)= x (mod7)是模反,就是2x = 1 (mod7), x = 4
: (2phi -1)2, phi = 1.618... 黄金分割率
: 8是二进制的1000
: 11,0x0B不就是0B么,还是16进制
: 有包子没?
h*i
32 楼
给数学家更合适
T*U
33 楼
这也要用数学?在12点的地方放坨屎,也是十二点。
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