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Calculating an integral with Math. 5.2 and Math. 7.0

Posted 2 days ago

Ecuacion resuelta con Math 5.2 Pero la misma ecuación Math 7.0 NO puede resolverla, tiempo de compilacion 1.5 horas y nadaEcuación NO resuelta con Mth 7.0

POSTED BY: Gennaro Flowers
4 Replies

Welcome to Wolfram Community! Please make sure you know the rules: https://wolfr.am/READ-1ST

The rules explain how to format your code properly. Posting code Images doesn't help other members to copy your code. Please EDIT your post and make sure code blocks start on a new paragraph and look framed and colored like this.

int = Integrate[1/(x^3 - 1), x];
Map[Framed, int, Infinity]

You can also embed notebook or attach notebook.

enter image description here

POSTED BY: EDITORIAL BOARD

Hi,

About "I've not changed the assumptions": I just meant that the assumptions in the two codes are different. The second code is missing the important one, a > 0 && b > 0 && a > b, at the time that Integrate[] is evaluated.

Integrate[] changes every version, I think. The exact changes are unknown to me.

POSTED BY: Michael Rogers

This is a formula to obtain the Geometric Mean Distance of a rectangle (as area) with sides a (base) and b (height).

I've not changed the assumptions, I've separated them in an attempt to make the Math 7.0 algorithm better understand what I want to do.

I know that the inequalities are not fulfilled in the entire integration range but with Math 5.2 work properly.

Do you know if that has been changed in Math 5.2?

Anyway, thank you very much for your interest in answering my post.

POSTED BY: Gennaro Flowers

Line In[3] overwrites the setting of assumptions in line In[2], which overwrote the setting of assumptions in line In[1]. Arguably the assumptions in line 1 are the most important. In the first code you used all the assumptions. Why did you change the assumptions?

The assumptions y2 >= y1 and x2 >= x1 do not hold through out the domain of integration. Neither do y2 > y1 and x2 > x1 as the inequalities appear in the other code. I don't know how they work in the old versions you ask about, though.

POSTED BY: Michael Rogers
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