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60
Funny thing. Multiplying both the sides by 0?
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25
Derivative of the $2$-norm of a multivariate function
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22
Rank product of matrix compared to individual matrices.
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16
matrix similarity upper triangular matrix
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16
How many times to roll a die before getting two consecutive sixes?
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15
Associativity of $\iff$
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12
$x^2+1=0$ uncountable many solutions
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11
Can an event be possible if its probability is zero?
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11
Mean value theorem for the second derivative, when the first derivative is zero at endpoints
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10
What is the origin of the determinant in linear algebra?
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9
Prove $\frac{1}{3}(x+y+z)^2 \geq xy + yz + xz.$
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8
prove that $\operatorname{fib}(n)<{(5/3)}^n$
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8
Two definitions of $\limsup$
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7
Why do hyperbolic “trig” functions seem to be encountered rarely?
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7
Is $\mathbb Z _p^*=\{ 1, 2, 3, … , p-1 \}$ a cyclic group?
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7
Finding a function from the given functional equation .
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6
G is an abelian group. Prove $G^{(n)}$ is a subgroup of G
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6
Full Adder boolean Algebra simplification
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5
Countability of irrationals
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5
Showing that a function is bijective
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5
Calculate $\lim_{n\to\infty}[(1+x)(1+x^2)(1+x^4)\cdot\cdot\cdot(1+x^{2n})]$, $|x|<1$
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5
Subtraction of slope in gradient descent
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5
Show that the LU decomposition of matrices of the form $\left[\begin{smallmatrix}0& x\\0 & y\end{smallmatrix}\right]$ is not unique
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5
Is $E(xy) \geq E(x) E(y)$?
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5
Newton's method in higher dimensions explained
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5
Biharmonic Equation on a square (fourier series solution needed)
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5
Show that an integral domain with every strictly decreasing chain of ideals $I_1 \supset I_2\supset \cdots $ finite in length is a field.
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5
Showing $(P\to Q)\land (Q\to R)\equiv (P\to R)\land[(P\leftrightarrow Q)\lor (R\leftrightarrow Q)]$ {without truth table}
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5
Is differentiating on both sides of an equation allowed?
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5
Prove that $\frac{1}{n+1} + \frac{1}{n+3}+\cdots+\frac{1}{3n-1}>\frac{1}{2}$
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