Bill Kleinhans
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 1d answered Technique for proving four points to be concyclic Apr21 awarded Yearling Apr11 answered If $A+B=\pi/3$ then what will maximum value of $\tan(A).\tan(B)$? Apr8 comment Prove if $7\mid a^2+b^2 \longrightarrow 7\mid a$ and $7\mid b$ Fermat's theorem on sums of two squares. Apr7 answered Can ratios similar to those related to the surface area of a circle and sphere be applied to determine properties of a 3-sphere? Apr6 answered How to maximize shipping box volume Mar26 comment Finding the dimensions of a cuboid for minimal surface area The arithmetic mean is greater or equal to the geometric mean, with equality if and only if all the quantities being averaged are equal. Very powerful, since it often gives an absolute maximum or minimum. Mar26 answered Determining points on a 3-dimensional intersection closest to the origin Mar25 comment Homework Problem About Finding a Value of $k$ for Which the Given System of Equations Has No Solutions Make the two lines parallel. Mar25 answered Finding the dimensions of a cuboid for minimal surface area Mar24 answered Average of square roots's sum vs. square root of an average Mar24 answered Find rational points on $x^2 + y^2 = 3$ and on $x^2 + y^2 = 17$ Mar24 answered Show that $A_3$ is a normal subgroup of $S_3$. Mar24 comment Prove that $\sqrt{3}+ \sqrt{5}+ \sqrt{7}$ is irrational In this case, the Galois transformations involve changing the signs of any or all of the roots of the three primes. Total of eight transformations, including unity. Your suggestion is not included. Mar23 answered finding the local extremum of a function of 2 variables Mar22 answered Prove that $\sqrt{3}+ \sqrt{5}+ \sqrt{7}$ is irrational Mar19 answered Why if we have more vectors than rows can the vectors not be linearly independent? Mar18 revised Prove any group with 3 elements is isomorphic to $\mathbb{Z}_3$ added 108 characters in body Mar17 answered Prove any group with 3 elements is isomorphic to $\mathbb{Z}_3$ Mar17 comment Assume that $1a_1+2a_2+\cdots+na_n=1$, where the $a_j$ are real numbers. Remember, the sum of the weights must equal one, so you need to scale the expressions.