What is the smallest number of strictly isosceles acute triangles that an equilateral triangle can be divided into? The following construction is by WR Somsky, with 13 triangles. Is this minimal? 
2026-05-14 22:50:11.1778799011
Division into strictly isosceles acute triangles
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WR Somsky is totally dominating this question. He's lowered it to 12 triangles. Since every 60 degree angle needs to be split, this is likely approaching a level where a minimality proof exists.