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coffeemath

United States

I teach math at St. John Fisher College in Rochester.

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Top Questions
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45
Does $0 < x < 0$ imply $x =0$?
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43
How to determine the arc length of ellipse?
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16
$f(x)=1/q$ for $x=p/q$ is integrable
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16
Is there a maximum value between open $(0,1)$ set?
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15
How prove for any $k$ then have $a^2_{1}+a^2_{2}+a^2_{3}+\cdots+a^2_{k}=m^3$
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14
Drawing by lifting pencil from paper can still beget continuous function.
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12
how to find integer solutions for $axy +bx + cy =d$?
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11
Is there a bijective function $f: \mathbb{R}\to\mathbb{R}$ that is discontinuous?
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10
$x^4+5y^4=z^2$ doesn't have an integer solution.
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9
Function that sends $1,2,3,4$ to $0,1,1,0$ respectively
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9
Find intersection of two 3D lines
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9
Get the equation of a circle when given 30 points
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9
Puzzle on the triangle.
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8
Diophantine equation to characterize natural numbers
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8
Euclidean distance and dot product
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8
Showing $(x,y)$ pairs exist for $\sqrt{\quad\mathstrut}$
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7
How do I integrate $\int\dfrac{e^x - e^{-x}}{e^x + e^{-x}}\,dx$?
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7
Rational solutions of $y^2 = x^3 - x$
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7
Is the intersection between two $n$-spheres an $(n-1)$-sphere?
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7
minimum value of $\cos(A-B)+\cos(B-C) +\cos(C-A)$ is $-3/2$
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7
Hard floor function problem
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7
How to find the inverse of a piecewise function
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7
Closed form for $a_{n+1} = (a_n)^2+\frac{1}{4}$
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7
For the Fibonacci numbers, show for all $n$: $F_1^2+F_2^2+\dots+F_n^2=F_nF_{n+1}$
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7
Proving complex numbers
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7
Parallel postulate from Playfair's axiom
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7
Find a polynomial only from its roots
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7
Prove that the unit open ball in $\mathbb{R}^2$ cannot be expressed as a countable disjoint union of open rectangles.
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7
“How I wish I could calculate pi” analogs…
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6
Showing $\sum_{i = 1}^n\frac1{i(i+1)} = 1-\frac1{n+1}$ without induction?
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