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Apr
7
awarded  Nice Answer
Jan
20
comment Is is possible to obtain exactly 16 black cells?
Sorry, ran out of time in my last attempt, which started off wrong.. Here is a derivation of the formula for the number of black cells. My reasoning is this, if the size of the grid is X rows and X columns: change r rows gives rX black cells; changing c columns reverts cr cells to white (crossing the r rows), and c(X-r) cells to black (between the r rows). The total of black cells is thus rX - cr +c(X-r), which simplifies to X(r+c)-2cr as above
Jan
20
comment Is is possible to obtain exactly 16 black cells?
I have tried this on smaller grids and get a different formula for the number of black cells left. My reasoning is this:
Dec
9
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Apr
30
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Apr
30
accepted What is graph of graph of $y = (x-1)\sqrt{x}$
Apr
30
asked What is graph of graph of $y = (x-1)\sqrt{x}$
Aug
9
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Aug
9
revised relationship of polar unit vectors to rectangular
corrected the description of the resolution of the radius vector.
Aug
9
answered relationship of polar unit vectors to rectangular
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Mar
12
answered Too old to start math
Sep
27
revised What are imaginary numbers?
I added references to two reviews
Sep
26
comment What are imaginary numbers?
Thank you @Martin. I followed the link and am suitably chastened, but I did, and do, enjoy reading this book. I still think it might well be a nice introduction to complex numbers for someone who has not become acquainted with them already.
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26
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Sep
26
answered What are imaginary numbers?
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