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 Aug 31 comment Can 720! be written as the difference of two positive integer powers of 3? @R.. Are you sure a non-mathematician will find using ternary intuitive? Jun 24 awarded Popular Question Mar 21 awarded Informed Oct 23 comment Confusing algebra rule: why $\frac{7^{n+1}-1}{6} + 7^{n+1} = \frac{7^{n+2}-1}{6}$? @DavidRicherby And quoting the "equality" page: "An equation is the problem of finding values of some variables, called unknowns, for which the specified equality is true." You can probably define an "unknownless equation," but I've always heard the equality vs. equation distinction as relation vs. problem. Oct 23 comment Confusing algebra rule: why $\frac{7^{n+1}-1}{6} + 7^{n+1} = \frac{7^{n+2}-1}{6}$? @DavidRicherby It's an equality. It would be an equation if $n$ was an unknown we wanted to solve for. Here, it's not. Dec 20 comment Minimizing with Lagrange multipliers and Newton-Raphson +1. Thank you very much, I'm finally beginning to understand it. Could you please clarify why it's safe to neglect the second derivative of the constraints (which happens twice in your derivation, if I understand correctly)? Jan 11 awarded Supporter Oct 26 awarded Student Oct 26 asked Minimizing with Lagrange multipliers and Newton-Raphson