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1d
comment Showing one-to-one and onto
Yes, that's right. So the function is onto but not 1-1.
1d
answered Showing one-to-one and onto
2d
comment Simplifying a ratio to lowest form: How to tell which number to divide by both quantities of the ratio to get to lowest form in just one step?
No, there really isn't. With big numbers, the best method (by hand) is to do exactly what you've done - divide by something obvious to reduce the size, then keep doing that. At some point there will not be obvious factors, in which case you will want to factor numerator and denominator. You might want to search for "factoring integers" or some such to get more information. In general, factoring is a difficult problem.
Aug
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reviewed Leave Open solve the differential equation $y'''=\sin(y)$
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reviewed Close Proof of $a^n+b^n$ divisible by a+b when n is odd
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reviewed Leave Open How find this $\int_{0}^{\infty}xe^{-x}\left(\int_{0}^{\pi/2}(1-e^{x-x\csc{t}})\sec^2{\!t}\,\mathrm dt\right)^2\,\mathrm dx=\frac{1}{3}$
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reviewed Close $f^{-1}(S)$ of a recursively enumerable set
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reviewed Leave Open How to express open interval in roster notation?
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reviewed Leave Open Non-linear (?) differential equation
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reviewed Close If $\bar X$ is open, then $X=\bar X$.
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reviewed Close Eigenvalues of matrix with all $1$'s.
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reviewed Close Linear Non-Homogeneous Recurrences - Guessing the particular solution
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reviewed Close How can we represent complex numbers in 2-d plane(i.e. complex plane) if there is no ordinal relationship between them?
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reviewed Leave Open Showing that a sequence is unbounded
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reviewed Close Integrating Factor.
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reviewed Close $B_1\cap B_2=0$ and $B_1 \cup B_2$ is a basis for $V_1\cup V_2$.
Aug
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answered If $n=x^2+3y^2$ then any prime in $n$'s factorization is of an even power.
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reviewed Leave Closed Conditions for Riemann integrability
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reviewed Close assumptions of t-test of correlated terms
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reviewed Close Deriving the integration limits after a non-standard change of variables in a triple integral