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seen Jan 10 at 22:35

Dec
15
comment Find $\frac{\partial p}{\partial t}$ in terms of $p$
you're taking the positive root of t. it is p-- the negative one as André Nicolas says.
Dec
15
comment How to formally model the “hesitation” in the hat-guessing puzzle?
Heard this with 1 black and 2 whites way back in my childhood. it isn't a new puzzle.
Dec
15
comment 3 Homework Question. Counting, Induction and Pigeonhole principle
Intuition-- for Q2: Try to come up with an even number that doesn't have 2 as its divisor. For Q7: try a placement with $n_{i}-1$ objects at each $n_{i}$.
Dec
15
comment Prove $|a+b|+|a-b| \geq |a|+|b|$
@Potato: that's out of context and irrelevant here.
Dec
15
answered What is the best base to use?
Dec
14
revised How can I calculate the number of models in which a logical sentence is true?
added 110 characters in body
Dec
14
comment How can I calculate the number of models in which a logical sentence is true?
Take the postfix traversal. It evaluates the tree for expression more efficiently, looks much better in the code and is an old structure-- very well covered in literature. I've put the first, "start w.the leaves and working it up to the root" rather as a comment for explaining the structure.
Dec
14
comment Three fair six-sided dice are tossed and the numbers showing on top are recorded.
(2) and (3) seem to be continuation of (1) so check that out with your source what exactly is being asked.
Dec
14
comment Prove $|a+b|+|a-b| \geq |a|+|b|$
Yw. glad that helps.
Dec
14
answered Prove $|a+b|+|a-b| \geq |a|+|b|$
Dec
14
answered How can I calculate the number of models in which a logical sentence is true?
Dec
14
answered How to solve $2{x_{1}}+2{x_{2}}+{x_{3}}+{x_{4}}={12}$
Dec
14
comment What is Validity and Satisfiability in a propositional statement?
The expression in your Q is satisfiable but not valid. It returns true for (p, q, r)=(true, true, true) and false for (true, false, true).
Dec
14
comment What is Validity and Satisfiability in a propositional statement?
The expression (p .AND. q) is satisfiable-- it returns true whenever both p and q are true. On the other hand, (p .OR. .NOT.p) is valid, it always is true regardless of the value of p.
Dec
14
answered What is Validity and Satisfiability in a propositional statement?
Dec
14
answered On Multiplication,Division,Addition,Subtraction
Dec
13
comment Number of ways to choose k people from an alphabetized list of n people, with “gap” g
Yw, Glad it helped. I don't think there is. It is a recursive solution. The algorithm would be the solution "formula" itself. There is a lengthy closed form for its count though and I haven't figured it-- yet.
Dec
13
comment Number of integer solutions
You have infinite number of solutions whenever you have a solution with non-0 terms on the LHS.
Dec
13
answered Number of ways to choose k people from an alphabetized list of n people, with “gap” g
Dec
13
comment Calculating the aspect ratio of the rotated rectangle on the image
the credit card itself can be a reference. those cards come in standard size and thus ratio.