How to show in $R^2$, the $f(x,y)=(x^4+y^4)^{1/4}$ defines a norm on $R^2$.
103806
How to prove triangle inequality for $p$-norm?
116273
Does every $\mathbb{R},\mathbb{C}$ vector space have a norm?
123505
how to prove vector norm equivalence in finite dimensional space($\mathbb{R}^{n}$)?
55067
Norm of self-adjoint operator
40293
Understanding the definition of norm of tensors on a Riemannian manifold
145390
Formal power series ring, norm.
19916
$f(x)=f(x^2+ 1/4)$ , $f$ is continuous from $\mathbb{R}$ to $\mathbb{R}$
3400
How to show that the norm of a fractional ideal is well-defined?
68409
Consider $f(x,y)=\sup_{θ,φ}\{||e^{i θ }x+ e^{i φ }y||^2: θ,φ∈R\}$ in which $x,y\in\mathbb C^n$
145368
How to show $f:Y\to X^{+}$ is continuous?
73073
Differentiating $y=x^{2}$
31295
$x+y\sqrt{2}$ infimum ($x,y\in \mathbb{Z}$)
7775
Show that $|x-y|\leq |x|+|y|$.
28125
Showing that $1 - \frac{x^2}2\leq\cos x$, $\forall x \in \mathbb{R}$
56983
Square of a function with an essential singularity
104148
Showing the norm' is non-negative
137983
Normalisation of $k[x,y]/(y^2-x^2(x-1))$