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Practical tools, used by over 150,000 people.

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I develop practical tool apps to make daily life and work more comfortable. Find a little help for your everyday.

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Tool apps for diagrams, schedules, and tables
73 apps for everyday possibilities

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All the apps I have released. Open an app to learn more.

Mandala

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Workshop Materials

These are materials created for past study sessions.

For our algorithm study group, we use the book 「 アルゴリズムイントロダクション 第3版 第1巻: 基礎・ソート・データ構造・数学 (世界標準MIT教科書) 」 which is used as a textbook at MIT and elsewhere. It provides very thorough explanations of mathematical proofs. Some parts are challenging, but with patience you can build a solid understanding.
Originally published in English as ( Introduction to Algorithms (The MIT Press) ) it is a tome of over 600 pages.

There are many books on design patterns, but the so-called bible is 「 オブジェクト指向における再利用のためのデザインパターン 」 commonly known as the 「 GoF book 」 . However, it can be a bit formal and hard to read, so I recommend 「 増補改訂版 Java言語で学ぶデザインパターン入門 」 instead.

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