Untitled/unsorted collection of math notes Dennis Yurichev Untitled/unsorted collection of math notes Dennis Yurichev May 18, 2023 Contents 1 Unsorted parts 1 1.1 Fencepost error / off-by-one error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 GCD and LCM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.2.1