Incorrect formula in the "Exact Solutions" section of the differential equations chapter

[WarrenWeckesser]

In the first table in the "Exact Solutions" section of the differential equations chapter, the formula for the exact solution of a linear system uses a sum instead of an integral. The source line is

tutorial/chapters/diffequation.md

Line 40 in 3960fb6

$$\frac{dy}{dx} + P(x)y = Q(x)$$ | $$y=e^{-\sum_{x_0}^xP(x)dx}(y_0 + \sum_{x_0}^xQ(x)e^{\sum_{x_0}^xP(x)dx}dx)$$

)

(Does this repo still use github issues? It looks like the last issue was created back in 2020!)

[jzstark]

Thank you so much for pointing that out Warren! Yes, it's a little bit inactive currently, but any update is still much appreciated! You are welcome to make a small PR about this issue!

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On Sun, 29 Jun 2025 at 18:56, Warren Weckesser ***@***.***> wrote: *WarrenWeckesser* created an issue (owlbarn/tutorial#129) <#129> In the first table in the "Exact Solutions" section of the differential equations chapter, the formula for the exact solution of a linear system uses a sum instead of an integral. The source line is https://github.com/owlbarn/tutorial/blob/3960fb6cc46cab86fa02e92c55492338f368a419/chapters/diffequation.md?plain=1#L40 ) (Does this repo still use github issues? It looks like the last issue was created back in 2020!) — Reply to this email directly, view it on GitHub <#129>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAK6ZAYVG6F6WJTDIIHMC4T3GALFBAVCNFSM6AAAAACAMMRNTCVHI2DSMVQWIX3LMV43ASLTON2WKOZTGE4DMMZVG42TMNY> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>