Academic Test / 学术测试
2026-09-20
This is a test post for academic notes.
Inline mathematics: $e^{i\pi}+1=0$.
Displayed mathematics:
\[H=-t\sum_{\langle i,j\rangle,\sigma} \left(c^\dagger_{i\sigma}c_{j\sigma}+\mathrm{h.c.}\right) +U\sum_i n_{i\uparrow}n_{i\downarrow}.\]