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  • 44 votes cast
Mar
31
awarded  Notable Question
Mar
10
comment How to find all possible pairs of the cells in a table excluding those from the same column
and then replace the other element in the taken combination. So the total amount of combinations in the table should be the amount of combinations in a row multiplied twice for the amount of rows.
Mar
10
comment How to find all possible pairs of the cells in a table excluding those from the same column
it wasn't very clear, but I thought I got it. For me this There are two independent choices of a row, one for each of the columns chosen is not clear. What does it mean "the columns chosen"? I do not choose columns, except the columns to which each element from any combination belong. So I have understood it this way: suppose I took the first row. I can take all combinations of the elements in it. For each of this combinations I can take a corresponding one from the other rows by replacing the first or the second element with one from every other row, hence the choice of n / k rows
Mar
10
comment How to find all possible pairs of the cells in a table excluding those from the same column
thank you very much
Mar
10
comment How to find all possible pairs of the cells in a table excluding those from the same column
I would like to elaborate, if you don't mind. For each combination in a row, there are (n/k) combinations in the table which contain the first element of the chosen combination and (n/k) combinations which contain the second element. So the final amount is the amount of combinations multiplied twice for the amount of rows, according to the multiplication principle
Mar
10
accepted How to find all possible pairs of the cells in a table excluding those from the same column
Mar
10
asked How to find all possible pairs of the cells in a table excluding those from the same column
Nov
22
awarded  Popular Question
Nov
13
awarded  Popular Question
Sep
13
accepted Software to easily draw 3d plots from functions
Sep
13
comment Software to easily draw 3d plots from functions
it's funny, but as far as I remember, I actually resorted to GeoGebra in that situation, it is now installed on my desktop
Jul
23
awarded  Notable Question
Feb
22
awarded  Popular Question
Feb
4
accepted Does a complex number multiplication have a geometric representation and why?
Feb
4
comment Does a complex number multiplication have a geometric representation and why?
okay, thank you, so I've understood that the statement that a complex number can be represented by a vector is incorrect. Please correct me, if I'm wrong
Feb
4
asked Does a complex number multiplication have a geometric representation and why?
Dec
15
awarded  Caucus
Aug
13
accepted How to find a basis of an image of a linear transformation?
Aug
12
comment How to find a basis of an image of a linear transformation?
@BenWest thanks to you and André Nicolas, now it seems clear to me.
Aug
12
revised How to find a basis of an image of a linear transformation?
edited title