Linked Questions
28 questions linked to/from Why does Simplify ignore an assumption?
6
votes
2
answers
134
views
Getting around symbol favoritism of Simplify and FullSimplify [duplicate]
Simplify may or may not simplify depending on the symbols you use for its assumptions are good. For example, here is a case where ...
- 19.7k
12
votes
0
answers
212
views
Why does this happen with FullSimplify? [duplicate]
It is stated at the Wolfram Documentation Center (FullSimplify/Possible Issues) that:
Why and when this could happen? How to avoid it? Any patterns?
Edit:
As pointed out in the comments, this ...
- 1,911
4
votes
1
answer
141
views
Simplify x+y=5 fails with assumption y = 2x, but works with x = 2y. Why? [duplicate]
I am trying to understand how assumptions and simplification works with this simple example:
x+y=5, assume x = 2y
So I write:
...
- 930
1
vote
0
answers
126
views
FullSimplify, Assumptions: Replacing Complex expressions by Simpler Ones as per Leaf Count [duplicate]
I have been trying to simplify equations using Mathematica of the following basic form:
$$\text{FullSimplify}\left[x^2+y^2,\text{Assumptions}\to x^2+y^2==c^2\right]$$
With the output being,
$$x^2+y^2$$...
2
votes
0
answers
68
views
Change a single letter changes the result [duplicate]
these two codes give different result.
FullSimplify[a-b,Assumptions->a==1+y&&b==1+y-x]
this give x
...
- 10.2k
2
votes
0
answers
59
views
Abs and ^2 within Solve: curious speed characteristics [duplicate]
I was playing around with the Solve function recently and found a behavior I couldn't explain. The equations I'm working with look like
...
- 405
0
votes
0
answers
42
views
Mathematica can't simplify disguised expression [duplicate]
When I simplify the following quartic polynomial with a linear constraint;
Simplify[x y z a + x y z b , a + b + c == 0] // Expand
I get what to me seems like the ...
- 1,278
65
votes
2
answers
15k
views
What is the difference between a few simplification techniques?
I am trying to understand the difference between Refine, Simplify and FullSimplify, and when ...
- 7,539
33
votes
1
answer
2k
views
A better simplification function
I am creating this question and posting an answer to it as a help for those who have problems with Mathematica simplification oddities that appear in other questions on the site.
First of all, there ...
- 1,911
16
votes
2
answers
3k
views
Is there a way to to substitute for symbols, simplify, and back-substitute?
In papers in physics and mathematics one often encounters longer mathematical expressions which have to be, for intuition and typesetting, expressed using symbols standing for recurring patterns in ...
- 415
40
votes
2
answers
2k
views
Variable naming changes everything
Bug fixed in 10.0.0
I am having a rather unusual problem I do not understand with Mathematica where renaming one of the variables of my function causes the function to stop "working". Here is the ...
- 503
12
votes
2
answers
798
views
Surprises simplifying simple polynomials
I came across some somewhat surprising behavior of Simplify today, on something very simple. Let's take two cubic polynomials that we know have the same value:
<...
- 18.6k
2
votes
1
answer
3k
views
Simplifying complicated fractions
I need to simplify a long expression with a denominator in the form of a+b. To keep it simple, let me replace the long expression with a short example:
...
- 7,377
8
votes
1
answer
2k
views
Why doesn't FullSimplify get rid of the common factor in this expression?
FullSimplify does not get rid of the z factor in the following expression:
...
- 1,471
12
votes
1
answer
303
views
Unable to evaluate reasonable max expression
Consider the following statement:
Max[0, Sqrt[1 - Cos[4 \[Theta]]]]
You'll find that Mathematica won't evaluate this, because it doesn't know the range of $\...
- 523