Wikipedia:Reference desk/Archives/Computing/2024 July 4

= July 4 =

Using the free VPN feature of the Opera browser
Is there a way to choose a specific country (where the connection appears to come from) when one uses the free VPN feature of the Opera browser? I installed Opera and when I tried to choose the country it only gave me the option between several regions of the world (Europe, Asia, North America, ...) but not how to pick a specific country in those regions. The explanation of their Help Chatbot was either unintelligible or false. Has anyone here used Opera and their free VPN and can they tell me if what I want to do is possible? Or is that a feature of their pro VPN? How about other free VPNs (like ProtonVPN): do they allow the free choice of the country or is that a premium feature that only paying VPNs allow? 178.51.74.75 (talk) 06:51, 4 July 2024 (UTC)
 * According to the comparison chart at, the free Opera VPN has "3 general locations" and the paid version has "30+ unique locations" but doesn't say if you get to choose a country or if there are just more region choices. There is an Opera forum at  where you might be able to get more information.  RudolfRed (talk) 18:46, 4 July 2024 (UTC)

Fourier transform and eigenvalues
Did x raised to the n with n being an odd number most likely follow (come after) the Uxx operator and eigenvalues? Afrazer123 (talk) 22:05, 4 July 2024 (UTC)
 * There is going to have to be some clarification before an answer appears. By Uxx do you mean $$ {\partial^2 \over \partial x^2} $$ ? And is your xn supposed to be part of your Fourier transform calculation? Perhaps https://cuhkmath.wordpress.com/2013/05/10/fourier-coefficients-as-eigenvalues-spectrum/ is of interest to you. Graeme Bartlett (talk) 04:33, 5 July 2024 (UTC)
 * Yes, where x is a collection of spatial variables for u(x,t) and t is time. No. Afrazer123 (talk) 20:41, 9 July 2024 (UTC)