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Mar
1
reviewed Approve Number Theory Problem
Mar
1
answered Number Theory Problem
Mar
1
revised Number Theory Problem
added 14 characters in body
Mar
1
revised Prove that f is a constant function.
added 20 characters in body
Mar
1
answered Prove that f is a constant function.
Mar
1
answered Show that if $ab \equiv 1 \mod m$ then $\text{ord}(a) = \text{ord}(b)$
Mar
1
revised what are some of the oldest and most accurate approximations of pi?
added 523 characters in body
Mar
1
answered what are some of the oldest and most accurate approximations of pi?
Feb
27
comment Maximum weight of a topology on $\{ 1 , 2 , 3 , \ldots , n \}$
Thanks. I took $B(x)$ to be the intersection of all the open subsets containing $x$ (we can do it because there is a finite number of such subsets since the topology is finite)? Is this ok. Thank you
Feb
27
accepted Maximum weight of a topology on $\{ 1 , 2 , 3 , \ldots , n \}$
Feb
27
awarded  Strunk & White
Feb
27
comment Maximum weight of a topology on $\{ 1 , 2 , 3 , \ldots , n \}$
@pedro, I think the discrete has maximum weight.
Feb
27
accepted Topology in which there is a subbase smaller than any base.
Feb
27
asked Maximum weight of a topology on $\{ 1 , 2 , 3 , \ldots , n \}$
Feb
27
asked Topology in which there is a subbase smaller than any base.
Feb
27
revised Finding $f'(x)$ if $x\neq 0$ using definition of derivative
added 14 characters in body
Feb
27
answered “ If $f$ -$g$ are integrable over [a,b] then f and g are integrable over [a,b] ?”
Feb
27
answered Is an empty set equal to another empty set?
Feb
27
comment a differentiable function but its derivative is discontinuous everywhere
Volterra's function is discontinuous in a set of positive measure.
Feb
27
comment Is $\sqrt{x^2} = x$?
$i^2+3$ not 2i+3