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 Yearling
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Apr
5
comment Radio factory linear program
Hint: Translate the description into linear equations or inequalities - sentence by sentence. Decision variables (week-wise): producing workers. Dependent/derived variables: production volume, payments, working costs, mentoring workers, productive students (= additional workers or mentors). In your objective function you just added the revenues but forgot to subtract the costs.
Apr
4
answered An effective way to find missing minterms
Mar
27
answered A problem on solving functional equations
Mar
26
revised expanding boolean expression as maxterm
added 311 characters in body
Mar
26
answered expanding boolean expression as maxterm
Mar
4
revised Closed form for this 2 variable recurrence?
extended table
Mar
3
answered Closed form for this 2 variable recurrence?
Feb
10
answered Steepest-descent optimization method
Feb
9
answered Boolean Algebra Simplification
Feb
2
comment $n$ is a divider of $c$ if and only if $n = 2(c \mod (n-1)) - (c \mod(n-2)) + 2$
The equation holds for $n=7$ and $c=51$. But $7$ is no divider of $51$. Or, what do you mean by "same bit count"?
Feb
1
revised Find the numbers by XoR
added generalized proof, spelling
Feb
1
answered Find the numbers by XoR
Jan
27
comment Express Kirchoff's first law using power flow.
The sum of currents flowing into a junction node equals the sum of currents leaving the node. But the directions are different. Therefore, you have to use opposite signs.
Jan
17
awarded  Yearling
Jan
16
answered Permutations - n people and n seats
Jan
15
comment Re-arranging matrices/vectors
Your equation is not linear. It contains squares and products of variables. I don't see how this could be transformed in a linear equation. Check how a product of a matrix and a vector can result in a scalar $1$.
Jan
6
comment Using Binomial coefficient to solve a problem with unfair coins
Yes. If you always but the coin back into the bag after flipping, the coin mixture and thus the flipping probability stay constant.
Jan
6
comment Using Binomial coefficient to solve a problem with unfair coins
If you draw a fair coin first, you increase the percentage of unfair coins remaining in your bag. Therefore, the subsequent probability of head flips is increased. The probability of flipping a head is/remains dependent of the type of coin.
Jan
6
comment How many ways to tie $2$ ropes so that we do not have a loop
I would translate "not having any loop" to "not having more than one loop" or "having exactly one big loop". A loop-less construction would require two unconnected rope-ends.
Jan
6
revised Using Binomial coefficient to solve a problem with unfair coins
added 205 characters in body