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Jul
29
comment Implicit finite differences: Sufficient conditions for non-negativity
@uranix he is going back in time
Jul
29
revised Implicit finite differences: Sufficient conditions for non-negativity
edited tags
Jul
28
revised logarithm proof fallacious or not?
added 4 characters in body
Jul
28
answered logarithm proof fallacious or not?
Jul
28
comment Differentiability of multi-variable functions
@user160492 not exactly. Note that $f(0,y)=0$ but $f(x,0) \neq 0$. Can you compute $\frac{df(x,0)}{dx}$?
Jul
28
answered Finding all real numbers x such that $x \lceil x \lceil x \lceil x \rceil \rceil \rceil = 88$
Jul
28
revised Finding all real numbers x such that $x \lceil x \lceil x \lceil x \rceil \rceil \rceil = 88$
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Jul
28
awarded  Electorate
Jul
28
comment Mathematics of Magic Squares
Welcome to Math.SE! Hope you stay and contribute to the site :)
Jul
28
comment Sign of eigenvalues of $A$ by $\det(A-\lambda I)=\lambda \det(B+D-\lambda I).$
You likely mean $D$ not $C$ in the first sentence
Jul
28
answered Logs - Simplifying with arbitrary constant
Jul
28
answered inequality question?
Jul
28
reviewed Approve inequality question?
Jul
28
comment Partial differential equation
you could find it numerically, do you need an analytic solution?
Jul
28
comment Partial differential equation
i edited to the best of my ability to understand, please check this is what you intended to ask
Jul
28
revised Partial differential equation
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Jul
28
answered Differentiability of multi-variable functions
Jul
28
comment defining a sequence of numbers L n≥1, and prove something about it
@Zero you can, but I don't see how this will help
Jul
28
comment defining a sequence of numbers L n≥1, and prove something about it
@Zero note that $\phi$ and $\Phi$ both satisfy $x^2 = x+1$. Can you use this fact to complete the proof?
Jul
28
comment defining a sequence of numbers L n≥1, and prove something about it
@Zero the hint starts off by assuming that $L_n = \phi^n + \Phi^n$ and $L_{n-1} = \phi^{n-1} + \Phi^{n-1}$. This is the Inductive Assumption, and we should prove the statement for $L_{n+1}$...