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 Mar5 revised Real analysis: Show a continuous and nonnegative function on $[a, b]$ = 0 added 190 characters in body Mar5 revised Real analysis: Show a continuous and nonnegative function on $[a, b]$ = 0 added 190 characters in body Feb24 revised Real analysis: Show a continuous and nonnegative function on $[a, b]$ = 0 edited body Feb24 revised Real analysis: Show a continuous and nonnegative function on $[a, b]$ = 0 added 219 characters in body Feb18 answered Real analysis: Show a continuous and nonnegative function on $[a, b]$ = 0 Jan19 awarded Yearling Nov28 awarded Informed Nov26 answered Proving a function is bounded given that the function is uniform continuous over a bounded, closed domain Nov24 revised Lagrange Multipliers- Two constraints (Minimum) added 197 characters in body Nov24 answered Lagrange Multipliers- Two constraints (Minimum) Nov9 answered Annuity Future Value Factor Nov9 revised Annuity Future Value Factor Improved Formatting Nov9 suggested approved edit on Annuity Future Value Factor Nov9 comment Solving $\cos x=x$ @Sawarnik I thought that you would, but wanted to make sure. I don't really think that you could find an exact, closed-form solution. An analytical approach will, as you mentioned, likely yield an infinite sum. Nov9 comment Solving $\cos x=x$ You are looking for an exact solution correct (i.e. no numerical approximations)? Nov9 answered Non-negative, real matrix $\Rightarrow$ non-negative, real eigenvalues? Nov8 awarded Critic Nov7 awarded Commentator Nov7 comment Homogenous equation with only one solution A homogeneous equation always has the trivial solution. I believe he's asking if there are any systems with 2 equations in 3 unknowns that have only the trivial solution. I don't think there are any. Nov7 comment Homogenous equation with only one solution No, because when you row reduce to solve the system you'll have a free variable.