https://shuohui.uk/math/2026-06-07-%E4%B8%A4%E4%B8%AAladr%E4%B8%AD%E6%B6%89%E5%8F%8A-range%E5%8F%8A-null-%E7%9A%84%E8%AF%81%E6%98%8E%E6%97%B6%E5%B8%B8%E7%94%A8%E7%9A%84%E5%85%AC%E5%BC%8F/2026-06-06T17:28:00+00:00https://shuohui.uk/math/2026-06-06T17:28:00+00:00https://shuohui.uk/2026-06-06T17:28:00+00:00https://shuohui.uk/categories/https://shuohui.uk/tags/https://shuohui.uk/acg/