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Jan
19
revised How to write a definition of less than $<$?
added 232 characters in body
Jan
19
comment How to write a definition of less than $<$?
@TheChaz that can happen in a recursive definition.
Jan
19
answered How to write a definition of less than $<$?
Jan
17
revised How to find the length of a line in a tetrahedron
latax; missing brace added
Jan
15
awarded  Custodian
Jan
15
reviewed Reopen Solve the equation $2φ(x)=x $ for $x\in\mathbb N^+.$
Jan
15
revised Find the number of bicycles and tricycles
edited title
Jan
13
revised Congruences and prime numbers
formulas to latex
Jan
12
reviewed Close Given a complete graph of $n$ vertices $K_n$ (has all possible edges – one edge between pair of vertices).
Jan
12
comment How to solve instant insanity puzzle with graphs.
@SteveKass I related your answer to the question "how can I find the path from the graph I attached".
Jan
11
comment if the inverse images of all closed balls are closed, is $f$ continuous?
+1, I think this work for all f continous in $(0,\infty)$. So you can use a simpler f like f(x)=x or f(x)=1 in your example.
Jan
11
revised if the inverse images of all closed balls are closed, is $f$ continuous?
a typo in formula
Jan
8
revised Relation between ranks of submatrices of a matrix.
format with latext
Jan
8
reviewed Leave Open The number of real roots of $x\lfloor x\rfloor+187=\lfloor x^{2}\rfloor+\lfloor x\rfloor$
Jan
7
comment How to solve instant insanity puzzle with graphs.
@SteveKass "Probably not" is probably wrong. Even if it isNP-complete it is possible that it can be solved for input of small size.
Jan
7
comment How to solve instant insanity puzzle with graphs.
Photos are not useful especially if the numbers cannot be read because they are written to small. Put the data in an appropriate format: 3-column list. The first column is the label of the edge (the cube number) the second is the name of the the vertex of the edge with the smaller number (color) and the third column is the other vertex of the edge. But don't add a photo of the list to the post but add it as code (each line is preceded by four whitespace) so that one can copy and paste the data.
Jan
7
comment How to find out the number of ways to solve Instant Insanity
In Donald Knuth's paper Estimating the Efficiency of Backtrack Programs you can find an explanation.
Jan
5
comment Prove that if Triangles ABC = DEF in a metric geometry, then line AB contains exactly two of the points D, E, and F.
"Clearly $\overleftrightarrow{AB}$ cannot intersect any other side at any other point." Any other side of $\bigtriangleup ABC$ or of $\bigtriangleup DEF$ ?
Jan
5
revised Prove that if Triangles ABC = DEF in a metric geometry, then line AB contains exactly two of the points D, E, and F.
latex, overleftrightarrow
Jan
4
comment Prove that if Triangles ABC = DEF in a metric geometry, then line AB contains exactly two of the points D, E, and F.
definitions can be found here: math.furman.edu/~dcs/courses/math36/assignments.html