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If $w^n = 1$, then either $w$ has norm 1 or $n = 0$.
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For any real-valued normed field $a$ and any natural number $n$, we have $|n \cdot a| = n \cdot |a|$.
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For any real-valued field $a$ and any natural number $n$, $|a \cdot n| = |a| \cdot n$.
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The norm of a quotient of two numerals is the quotient of their norms.
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The norm of the difference of two real numbers is less than or equal to the absolute value of the difference of the two real numbers.
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If $x^2 = 1$, then $|x| = 1$.
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For any real normed algebra, the norm of any element is less than the norm of the element plus 1.
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The norm of a product of numbers is equal to the product of the norms of the numbers.
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The norm of the product of a family of elements is less than or equal to the product of the norms of the elements.
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If $z_i$ and $w_i$ are vectors with norm at most 1, then the norm of the difference of their products is at most the sum of the norms of their differences.
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If $z$ and $w$ are complex numbers with $|z| \leq 1$ and $|w| \leq 1$, then $|z^m - w^m| \leq m |z - w|$.
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The distance between a point and itself is zero.
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The distance between two points is always non-negative.
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$0 < \text{dist}(x, y)$ if and only if $x \neq y$.
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The distance between two points is never less than zero.
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The distance between two points is non-negative and is zero if and only if the points are equal.
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The distance between two points is the same as the distance between those points in the opposite order.
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The distance between two points is the same in either direction.
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The distance between $x$ and $z$ is less than or equal to the distance between $x$ and $y$ plus the distance between $y$ and $z$.
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The distance between two points is less than or equal to the sum of the distances from each point to a third point.
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The absolute value of the difference between the distance from $a$ to $b$ and the distance from $b$ to $c$ is less than or equal to the distance from $a$ to $c$.
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If $x \neq y$, then $0 < \|x - y\|$.
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$x \neq y$ if and only if $0 < \text{dist}(x, y)$.
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The distance between two points is less than or equal to the sum of the distances from each point to a third point.
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If the distance between $x$ and $z$ plus the distance between $y$ and $z$ is less than $e$, then the distance between $x$ and $y$ is less than $e$.
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If $x_1$ is close to $y$ and $x_2$ is close to $y$, then $x_1$ is close to $x_2$.
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If $x_1$ and $x_2$ are within $\frac{e}{2}$ of $y$, then $x_1$ and $x_2$ are within $e$ of each other.
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If $y$ is within distance $e/2$ of both $x_1$ and $x_2$, then $x_1$ and $x_2$ are within distance $e$ of each other.
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If the distance between $x_1$ and $x_2$ is less than $\frac{e}{3}$, the distance between $x_2$ and $x_3$ is less than $\frac{e}{3}$, and the distance between $x_3$ and $x_4$ is less than $\frac{e}{3}$, then the distance between $x_1$ and $x_4$ is less than $e$.
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A set $S$ is open if and only if for every $x \in S$, there exists an $\epsilon > 0$ such that for all $y$, if $|y - x| < \epsilon$, then $y \in S$.
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The open ball of radius $d$ around $x$ is open.
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The distance between two real numbers is the same as the distance between their real-algebraic counterparts.
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The set of real numbers greater than $a$ is open.
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The set of real numbers less than a given real number is open.
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The set of real numbers between two real numbers is open.
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The set of real numbers less than or equal to a given real number is closed.
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The set of real numbers greater than or equal to a given real number is closed.
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The set of real numbers between $a$ and $b$ is closed.
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The norm of the sign function is $0$ if $x = 0$ and $1$ otherwise.
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The sign of zero is zero.
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The sign function is zero if and only if the argument is zero.
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The sign of a negative number is the negative of the sign of the number.
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The sign of a scalar multiple of a vector is the scalar multiple of the signs of the scalar and the vector.
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The sign of 1 is 1.
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The sign of a real number is the same as the sign of its image under the embedding of the reals into any real normed algebra.
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The sign of a product is the product of the signs.
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The sign function is the quotient of $x$ and its absolute value.
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For any real number $x$, $0 \leq \text{sgn}(x)$ if and only if $0 \leq x$.
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For any real number $x$, $sgn(x) \leq 0$ if and only if $x \leq 0$.
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The norm of a vector is equal to the distance from the origin.
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The distance from $0$ to $x$ is equal to the norm of $x$.
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The distance between $a$ and $a - b$ is equal to the norm of $b$.
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The distance between two integers is the absolute value of their difference.
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The distance between two natural numbers is the absolute value of their difference.
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If $f$ is a function from a vector space to itself such that $f(b_1 + b_2) = f(b_1) + f(b_2)$ and $f(r b) = r f(b)$ for all $b_1, b_2 \in V$ and $r \in \mathbb{R}$, then $f$ is linear.
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A function $f$ is linear if and only if it satisfies the two conditions: $f(x + y) = f(x) + f(y)$ $f(cx) = cf(x)$
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The function $x \mapsto a x$ is linear.
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If $f$ is a linear function, then $f$ is a scalar multiplication.
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If $f$ is a linear function from $\mathbb{R}$ to $\mathbb{R}$, then there exists a real number $c$ such that $f(x) = cx$ for all $x \<in> \mathbb{R}$.
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The function $x \mapsto a \cdot \mathrm{of\_real}(x)$ is linear.
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There exists a constant $K$ such that for all $x$, $|f(x)| \leq |x|K$.
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There exists a nonnegative real number $K$ such that for all $x$, we have $|f(x)| \leq |x|K$.
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$f$ is a linear function.
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If $f$ is a linear map such that $\|f(x)\| \leq K \|x\|$ for all $x$, then $f$ is bounded.
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There exists a constant $K > 0$ such that for all matrices $a$ and $b$, we have $\|ab\| \leq \|a\| \|b\| K$.
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There exists a constant $K \geq 0$ such that for all matrices $a$ and $b$, we have $\|ab\| \leq \|a\| \|b\| K$.
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The function $b \mapsto a \cdot b$ is additive.
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The function $a \mapsto a \cdot b$ is additive.
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The product of $0$ and $b$ is $0$.
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The product of any number and zero is zero.
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The product of a negative number and a positive number is negative.
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The product of a number and the negative of another number is the negative of the product of the two numbers.
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$(a - a')b = ab - a'b$.
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$a(b - b') = ab - ab'$.
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The product of the sum of a family of functions is equal to the sum of the products of the functions.
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$\prod_{x \in X} \sum_{y \in Y} f(x, y) = \sum_{y \in Y} \prod_{x \in X} f(x, y)$
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The map $a \mapsto a \cdot b$ is a bounded linear operator.
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The map $b \mapsto a \cdot b$ is a bounded linear operator.
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$(x \cdot y - a \cdot b) = (x - a) \cdot (y - b) + (x - a) \cdot b + a \cdot (y - b)$
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The function $(x, y) \mapsto y \cdot x$ is a bounded bilinear function.
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If $g$ is a bounded linear operator, then the function $x \mapsto g(x)$ is a bounded bilinear operator.
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If $f$ and $g$ are bounded linear maps, then the map $(x, y) \mapsto f(x) \cdot g(y)$ is a bounded bilinear map.
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The identity function is a bounded linear operator.
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The function $f(x) = 0$ is bounded linear.
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If $f$ and $g$ are bounded linear maps, then so is $f + g$.
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If $f$ is a bounded linear operator, then $-f$ is a bounded linear operator.
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If $f$ and $g$ are bounded linear maps, then so is $f - g$.
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If $f_i$ is a bounded linear map for each $i \in I$, then $\sum_{i \in I} f_i$ is a bounded linear map.
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If $f$ and $g$ are bounded linear maps, then so is $f \circ g$.
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The multiplication operation is bounded bilinear.
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The function $x \mapsto xy$ is bounded linear.
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The multiplication by a fixed element $x$ is a bounded linear operator.
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The multiplication by a constant is a bounded linear operator.
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The function $f(x) = cx$ is a bounded linear operator.
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The function $x \mapsto x/y$ is a bounded linear operator.
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The function $f(x, y) = xy$ is a bounded bilinear function.
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The function $r \mapsto rx$ is a bounded linear operator.
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The function $x \mapsto rx$ is a bounded linear operator.
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The function $x \mapsto c x$ is a bounded linear operator on $\mathbb{R}$.
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The function $x \mapsto c x$ is a bounded linear operator on $\mathbb{R}$.
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