Short answer: I don’t think there’s a clear definition on that.

In fact, directed number is not a very rigorous mathematical definition. It’s just a fancy term to emphasize a number can be positive or negative. In that sense, arguing whether 0 is a directed number may not be very meaningful. After all, +0 = -0 = 0.

Why (-2)^0.1 =1.01931714 + 0.331196214 i ?

Is π digits random? (which means each digit appears very close to 10% of the time or not)

好有趣嘅問題，之前都冇諗過。上網見到呢篇 blog 寫得唔錯，結論係：未有 mathematical proof 證明到係 uniformly distributed (i.e. 10% chance of appearance)，但 empirical evidence 似乎話畀我哋知真係 10% chance。

https://blogs.sas.com/content/iml/2015/03/12/digits-of-pi.html

how do i rationalise the denominator

Haha 你竟然知道呢度可以用 LaTeX。返返你嘅問題：

New identity web

Haha a little surprise to the old IDENTITY users. Which one do you like better 🙂 ?

The new one of course!

Is 0 a directed number?

Short answer: I don’t think there’s a clear definition on that.

In fact, directed number is not a very rigorous mathematical definition. It’s just a fancy term to emphasize a number can be positive or negative. In that sense, arguing whether 0 is a directed number may not be very meaningful. After all, +0 = -0 = 0.

x(x-2)+A(x-1)≡x^2+B find the value of A and B

I don’t know how to do this question

is it a =2 b=-2

Sorry for the late reply.

You’re right. A = 2 and B = -2. Well done!

Anyone could explain the Mandelbrot Set?

That’s beyond our knowledge. Hopefully some mathematicians will pass by and explain a bit~