在日本，讲师岗位大多数情况下不是长期聘用的，所以叫做“非常勤”；副教授则是“常勤”，即终身岗位。刚毕业获学位的年轻人，一般只签定期合同。像东京大学这样的名校，从来不会直接留下刚毕业的学生，必须先到其他大学去，待到做出了学问，证明了自己，同时等来了空缺的职位，才会被召回母校。其中校友会的意见也很重要，例如1948年盐谷温退休以后，东大聘回在京都大学任教的仓石武四郎，长泽规矩也等校友的意见就起了很重要的作用。
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Scientists have some concerns about the technology, such as how well it works under varying weather conditions, how much material needs to be released, potential environmental impacts, and the lack of transparent methodology. As for Skyward Wildfire, they’re just hoping lightning doesn’t strike twice.
This proof is known as Dirichlet’s approximation theorem. At first blush, it only guarantees a single 2-good approximation for every real. Worse yet, the solution guaranteed by the proof might not comply with the rules of our game, because nothing stops it from producing exact approximations (ε = 0). So, what did we achieve?