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Questions on the use of numerical functions NIntegrate and NDSolve.
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How to avoid NDSolve::ndsz problem (singularity problem)
I have the next model
Vs = px 1/YXS (Mm x2[r])/(KS + x2[r]) x1[r]/(KO2 + x1[r])
Vo = px 1/YXO (Mm x2[r])/(KS + x2[r]) x1[r]/(KO2 + x1[r])
eqs = {{x1''[r] + 2/r x1'[r] == Vo/DO2, x1'[R0] == 0,
x …