Quantum Mechanics for Mathematicians
《Quantum Mechanics for Mathematicians》 · 第 216 页 · Section 6.5.2
For a coaugmented cooperad \(\mathcal C\), \(\Omega\mathcal C=(\mathcal T(s^{-1}\overline{\mathcal C}),d_2)\) is a differential graded operad called its cobar construction.