中密歇根大学男性學生團體(又名:兄弟會):Sigma Chi, Sigma Alpha Epsilon, Alpha Chi Rho, Phi Sigma Phi, Lambda Chi Alpha, Phi Kappa Tau, Sigma Pi, Delta Chi, Phi Sigma Kappa, Pi Kappa Phi, Beta
命题逻辑\chi \rightarrow \phi } IFF-2: ϕ → χ , χ → ϕ ⊢ ϕ ↔ χ {\displaystyle \phi \rightarrow \chi ,\ \chi \rightarrow \phi \vdash \phi \leftrightarrow \chi }
弗洛里-哈金斯溶液理论2 χ 12 ] {\displaystyle \Delta F_{m}=RT[\,n_{1}\ln \phi _{1}+n_{2}\ln \phi _{2}+n_{1}\phi _{2}\chi _{12}\,]\,} 等式左边的 Δ F m {\displaystyle \Delta F_{m}}