# Questions tagged [expression-test]

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### Bug in PositiveDefiniteMatrixQ?

Fixed in 10.1.0. Exists in at least 9.0.1 -- 10.0.2. This seems like a bug in PositiveDefiniteMatrixQ to me: ...
63 views

### Testing for membership with Bags?

Is there a faster way to test for membership in an Internal`Bag other than unpacking the whole thing like this? ...
117 views

Let's define ...
149 views

### How to test solvability of a Diophantine equation?

When applying the BRC theorem I need to test if an equation has a non-zero solution in integers. The equation is of form: $$x^2 + by^2 + cz^2 = 0$$ We could try to directly check if this equation ...
59 views

### Speed up for SequencePredictorFunction?

From Google Dive: SequencePredictorFunction is here, along with my test data. From pastbin: prediction function and data is here. Using the ...
36 views

### What is the proper way to feed this function as input and test if my statement is true?

$f(S)$ = {$n∈N$: $n=m²$ for $m∈S$} $S$ = $1,2,3$ Square each element in S Now, $S= 1, 4, 9$ All elements in $S$ are counting from $1$ to $N$. In this case $N=3$ $f(S)$ = {$n∈N$: $n=m²$ for $m∈S$} ...
46 views

### How to use === with condition?

I have two expressions, and they are same when k is positive and x is non-zero real number. Below code gives me ...