Axel Kemper
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 Apr5 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. Apr4 answered An effective way to find missing minterms Mar27 answered A problem on solving functional equations Mar26 revised expanding boolean expression as maxterm added 311 characters in body Mar26 answered expanding boolean expression as maxterm Mar4 revised Closed form for this 2 variable recurrence? extended table Mar3 answered Closed form for this 2 variable recurrence? Feb10 answered Steepest-descent optimization method Feb9 answered Boolean Algebra Simplification Feb2 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"? Feb1 revised Find the numbers by XoR added generalized proof, spelling Feb1 answered Find the numbers by XoR Jan27 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. Jan17 awarded Yearling Jan16 answered Permutations - n people and n seats Jan15 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 $1$. Jan6 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. Jan6 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. Jan6 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. Jan6 revised Using Binomial coefficient to solve a problem with unfair coins added 205 characters in body