如果n>1係整數，係咪會搵到正整數a,b,c令到4/n=1/a + 1/b +1/c?
好Q難 諗諗先
都係唔識
交比偉大既數學家們啦
好似見過過post ,好似話有，但係個數值勁難計同勁撚大
連登仔真係個個都IQ200
d 題目擺明係 MathStackExchange 搵啦
啱啱 google， 應該叫 Erdős–Straus conjecture
未有人解到， 但係 試計就試過有好多數可以
http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math01/erdstr00.htm
可唔可以講解下probability果課 果咩p同c唔係幾明 最好加少少例子 簡單果d都識 難少少已經唔識
[img]https://na.cx/i/i896795.png[img]
let a and b be integers such that ab + 1 is divisible by a^2 + b^2
prove that (a^2 + b^2) / (ab + 1) is the square root of an integer
咩係convolution
我只能去WIKI COPY DEFN 比你
問我有咩睇法既話我都係半桶水，唔係好識
淨係學過做SIGNAL PROCESSING用
樓主都識Fourier transform line integral個堆，好想瘋狂問數
我覺得Theory緊要D
Fourier Transform你比張Table基本上人人識計（都入電腦嫁啦
但佢可以SOLVE咩問題 原理係咩緊要D
點解轉完Fourier transform搵inverse有咩用，啱啱學淨係識計個lecturer又廢
你講Inverse Fourier Transform?
咁有時真係有需要調轉做
Application實有用，Solve differential equation果D
你本身有無話果科拎黎做咩先
啱啱學唔知有乜用，好似係signal
how to compute the singular homology groups for real projective spaces?
我幾多歲可以拍拖
可唔可以幫我計計
明明有啲書話dy/dx is not a fraction點解做chain rule,integration by sub , differential equations 嘅時候dy/dx可以拆開做分數
點解做chain rule,integration by sub , differential equations 嘅時候dy/dx可以拆開做分數
technically唔當係fraction
只係idea上係，同埋好多property似
實際上要嚴謹prove chain rule，牽涉好多細節
想知再講
Differential equation有咩用
點解唔可以用普通Function
點解做chain rule,integration by sub , differential equations 嘅時候dy/dx可以拆開做分數
technically唔當係fraction
只係idea上係，同埋好多property似
實際上要嚴謹prove chain rule，牽涉好多細節
想知再講
geometric 問唔問得
oblique cone parametric equation 係點搵？
點解做chain rule,integration by sub , differential equations 嘅時候dy/dx可以拆開做分數
technically唔當係fraction
只係idea上係，同埋好多property似
實際上要嚴謹prove chain rule，牽涉好多細節
想知再講
想知
geometric 問唔問得
oblique cone parametric equation 係點搵？
呢題我又未遇過，你有咩條件比左？
最直接係寫左一般cone條式，再將條式用rotation matrix將d variable rotate
樓主教唔教到大學工程嘅數
