\begin {sequent}
\begin {align*}
&t, \alpha :\Mor \\
|~ &\IsZeroForMorphisms \big ( \PreCompose ( t, \alpha ) \big )\\
\vdash &\PreCompose \big (\KernelLift ( \alpha , t ), \KernelEmbedding ( \alpha ) \big ) =_{\Mor } t
\end {align*}
\end {sequent}
\begin {sequent}
\begin {align*}
&t, \alpha :\Mor \\
|~ &\IsZeroForMorphisms \big (\PreCompose (\alpha , t)\big )\\
\vdash &\PreCompose \big (\CokernelProjection ( \alpha ), \CokernelColift ( \alpha , t )\big ) =_{\Mor } t
\end {align*}
\end {sequent}
\begin {sequent}
\begin {align*}
&L:\ListObj , T:\ListMor , i:\Int \\
| ~& \forall j \in [ 1, \dots , \Length ( L ) ]: \IsEqualForObjects \big (\Source ( T[1] ), \Source ( T[j] ) \big ) \\
\vdash &\PreCompose \big (\UniversalMorphismIntoDirectProduct ( L, T ), \\
&\ProjectionInFactorOfDirectProduct ( L, i ) \big ) =_{\Mor } T[i]
\end {align*}
\end {sequent}
\begin {sequent}
\begin {align*}
&L:\ListObj , T:\ListMor , i:\Int \\
|~ &()\\
\vdash &\PreCompose \big (\InjectionOfCofactorOfCoproduct ( L, i ),\\
&\UniversalMorphismFromCoproduct ( L, T ) \big ) =_{\Mor } T[i]
\end {align*}
\end {sequent}
\begin {sequent}
\begin {align*}
&A, B:\Obj , \tau_A , \tau_B :\Mor \\
|~ &()\\
\vdash &\PreCompose \big (\InjectionOfCofactorOfCoproduct ( [A, B], 2 ),\\
&\UniversalMorphismFromCoproduct ( [A,B], [\tau_A , \tau_B ] ) \big ) =_{\Mor } \tau_B
\end {align*}
\end {sequent}
\begin {sequent}
\begin {align*}
&\alpha , \beta , \tau_A , \tau_B :\Mor \\
|~ &\IsEqualForMorphisms \big ( \PreCompose ( \tau_A , \alpha ), \PreCompose ( \tau_B , \beta ) \big )\\
\vdash &\PreCompose \big ( \UniversalMorphismIntoFiberProduct ( [\alpha , \beta ], [\tau_A , \tau_B ] ), \\
&\ProjectionInFactorOfFiberProduct ( [\alpha , \beta ], 1 ) \big ) =_{\Mor } \tau_A
\end {align*}
\end {sequent}
\begin {sequent}
\begin {align*}
&\alpha , \beta , \tau_A , \tau_B :\Mor \\
|~ &\IsEqualForMorphisms \big ( \PreCompose ( \tau_A , \alpha ), \PreCompose ( \tau_B , \beta ) \big )\\
\vdash &\PreCompose \big ( \UniversalMorphismIntoFiberProduct ( [\alpha , \beta ], [\tau_A , \tau_B ] ), \\
&\ProjectionInFactorOfFiberProduct ( [\alpha , \beta ], 2 ) \big ) =_{\Mor } \tau_B
\end {align*}
\end {sequent}
\begin {sequent}
\begin {align*}
&\alpha , \beta , \tau_A , \tau_B :\Mor \\
|~ &\IsEqualForMorphisms \big ( \PreCompose ( \alpha , \tau_A ), \PreCompose ( \beta , \tau_B ) \big )\\
\vdash &\PreCompose \big ( \InjectionOfCofactorOfPushout ( [\alpha , \beta ], 1 ), \\
&\UniversalMorphismFromPushout ( [\alpha , \beta ], [\tau_A , \tau_B ] )\big ) =_{\Mor } \tau_A
\end {align*}
\end {sequent}
\begin {sequent}
\begin {align*}
&\alpha , \beta , \tau_A , \tau_B :\Mor \\
|~ &\IsEqualForMorphisms \big ( \PreCompose ( \alpha , \tau_A ), \PreCompose ( \beta , \tau_B ) \big )\\
\vdash &\PreCompose \big ( \InjectionOfCofactorOfPushout ( [\alpha , \beta ], 2 ), \\
&\UniversalMorphismFromPushout ( [\alpha , \beta ], [\tau_A , \tau_B ] )\big ) =_{\Mor } \tau_B
\end {align*}
\end {sequent}
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