find an ordered basis ot prove it doesn't exist
88442
Prove that there's no ordered basis $E$ in which $T{x\choose y}={0\choose y}$ can be represented as $1\ 2\choose 2\ 4$
16255
If $\mathop{\mathrm{Spec}}A$ is not connected then there is a nontrivial idempotent
126569
Can we find a well ordering on an infinite set with no largest element?
30003
Proving that Order for N is Anti-symmetric
147874
Why does the existence of independent statements not prove consistency?
70475
Proving a basis for inner product space V when $||e_j-v_j||< \frac{1}{\sqrt{n}}$.
21155
Finding basis of $\mathbb{Q}(\sqrt{2},\sqrt{3},\sqrt{5})$ over $\mathbb{Q}$
61640
Prove c exists for f:[0,1] -> R
76148
Show that $\exists c \in \mathbb{R} : f(c) = 0$
85540
Prove or Disprove the Existence of Solutions...
116908
Basis for set of nxn matrices with trace = 0
146421
How to prove a total order has a unique minimal element
3217
Construction of uncountably many non-isomorphic linear (total) orderings of natural numbers
32130
How to prove that a limit does not exist?
4946
Non-existence of irrational numbers?
113344
How do we prove that something is unprovable?
13656
Prove existence of a real root.