I am sorry because I write the following in Japanese. Show more

Recently I was taught the following two expressions formula, Show more

Now, I am interested in the following three. Show more

The best memory of my internet life is that twitter.com/takatasennsei taught me the attached images. In Japanese, it seems to be well known as "3×3の完全虫食い算一覧" gensu.co.jp/saito/puzzle/a65wo

Recently I made several tiling images using regular heptagons or 14-gons etc.

The image is combined "Olympic symbols" en.wikipedia.org/wiki/Olympic_ and "Tokyo 2020 Emblems" tokyo2020.org/en/games/emblem/

Japan has become a New Year, Congrats!

At Christmas Eve, I make images with reference to ENWP"Aleister Crowley's rendition of the Unicursal Hexagram, the symbol of Thelema" en.wikipedia.org/wiki/Aleister

Star Wall, not STAR WARS, it's joke…

The attached image is rough summary content of New Year Card, sorry Japanese.

I made image like before again, using the triangle of lengths's raito $37:13:\sqrt{2019}$ (similar to "Eisenstein triple" en.wikipedia.org/wiki/Eisenste and me twitter.com/wasanp_/status/104 )

The patterns of "中村義作万能分割" twitter.com/wasanp_/status/961 are about 4 cases as shown in the following picture.

Hello Mathstodon World! RT "Pythagorean tiling (divided 2019 square in a square) " sketch.pixiv.net/items/9018595

#### I have poor English, and PPAP.'s choices:

A Mastodon instance for maths people. The kind of people who make $\pi z^2 \times a$ jokes.

Use $ and $ for inline LaTeX, and $ and $ for display mode.