User talk:180.191.89.251

November 2010
We welcome and appreciate your contributions, but your recent edits to Circuit Theory/Second-Order Solution had to be undone. Please see What is Wikibooks? to learn more about what contributions are beneficial to Wikibooks. Please be aware that some edits can be considered vandalism, use the sandbox for any test edits you would like to make, and read the welcome page to learn more about contributing constructively to this project. Thank you. – Adrignola talk 13:41, 16 November 2010 (UTC)