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個人的メイン筆記具の変遷
トンボ鉛筆HB
→GRAPHGEAR1000 0.3mm(PG1013)+替芯(Uni 0.3-202ND B)
→Petit1万年筆タイプ(SPN-20F-B)
→Stilform ARC Aluminium (Warp Black)+0.5mm替芯(LP3RF12S5-B) (いまここ)

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A Mastodon instance named Mathtodon, where you can post toots with beautiful mathematical formulae in TeX/LaTeX style.