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2:23 AM
Here is a nice easy to produce kernel crash of V 13.1 for those to like to collect these things:

ClearAll[x];
integrand=((x^4-2*x^3+3*x^2-6*x)*Exp[x^2/3]*Log[(x-2)/(5*x)]^2+6*x*Exp[x^2/3]*Log[(x-2)/(5*x)])/(6*x-12);
Integrate[integrand, x]
(*after about 2 minutes, you'll hear a beep and kernel quit*)

report to WRI. It seems this existed also in V 13.0.1. I do not know about earlier releases.
 
 
3 hours later…
5:00 AM
not[idx_] := Complement[Range[NN], idx]

SC[A_, idx_] := A[[idx, idx]] - A[[idx, not@idx]] . Inverse[A[[not@idx, not@idx]]] . A[[not@idx, idx]]
I am not sure how to interpret the two lines of code
We have matrix $A$ and $SC$
but how are they getting SC from A using the code I dont understand
 

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