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 Yearling
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Mar
27
awarded  Yearling
Jan
6
comment Dividing by $x!$
In your second question, you do not have identical flags for all countries.
Jan
6
reviewed Edit Dividing by $x!$
Jan
6
revised Dividing by $x!$
improved formatting
Nov
17
reviewed Looks OK Subsets in axiomatic set theory - ZFC
Nov
9
reviewed Looks OK Gradient of a dot product
Nov
9
comment Minimum and maximum values of $(\vec{r}\times\hat{j}).\vec{c}$
HINT: What would be $ \hat{k} \cdot \vec{c} $?
Nov
9
revised Minimum and maximum values of $(\vec{r}\times\hat{j}).\vec{c}$
deleted 14 characters in body
Nov
9
revised Linear equations modulo different prime through CRT
deleted 6 characters in body
Nov
3
comment Find the maximum of the following function
$\frac{dy}{dt}$
Nov
3
reviewed Edit Find the maximum of the following function
Nov
3
revised Find the maximum of the following function
Math modeling enter
Nov
2
revised If a matrix is row equivalent to some invertible matrix then it is invertible
added 13 characters in body
Nov
2
comment Making a determinant easier to solve to find characteristic polynomial
Did you try finding the characteristic equation after column operation as suggested in the question?
Nov
2
revised Making a determinant easier to solve to find characteristic polynomial
deleted 19 characters in body
Oct
31
reviewed Looks OK Why is this not a linear transformation from P2 to P3?
Oct
31
reviewed Looks OK if $a(b-c)x^2+b(c-a)x+c(a-b)=0$ has repeated roots prove…
Oct
30
revised How many 5-digit falling numbers are there?
deleted 1 character in body
Oct
30
answered Sum of real numbers and modular arithmetic
Oct
30
revised Solve this using modular arithmetic
deleted 24 characters in body