Professor said there are 28 $\mathfrak{C}^{k}$ structures on $\mathbb{S} ^7$ during lesson. Then I checked myself and came across with others as: 992 for $\mathbb{S} ^{11} $ or just 1 for $\mathbb{S} ^{12} $. How can we calculate the number of structures? 
2026-03-28 12:55:55.1774702555
$\mathfrak{C}^{\infty}$ - Structures on Spheres
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