[數撚圍爐區] abc conjecture is still a conjecture (3)
吾不會數學
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當年讀到WOW WOW聲，一開波問鋪棋盤都O咗嘴
最後淨係學識pigeonhole principle
最後淨係學識pigeonhole principle
x+y=7
3x+y=3
唸左好耐
功課最後一題
3x+y=3
唸左好耐
功課最後一題
多謝巴打
其實complex number 當唔當scalar
做咩咁執着
C is a 1 dim vector space over C
C is a 2 dim vector space over R
C is a 1 dim vector space over C
C is a 2 dim vector space over R
即刻諗通咗
點解啲數學佬唔整個符號俾basis
咩符號
on the other hand, C is a field
Column space of A 可以寫Col(A)
Null Space 可以寫Nul(A)
但basis就冇 次次都要寫A basis of A =
Null Space 可以寫Nul(A)
但basis就冇
次次都要寫A basis of A =因為basis is not unique
Because basis for a vector space is not unique.
比你追秒
原來係因為咁
Real vector space 可以 complexified 做 complex vector space
咁啱入黎