Question and Answers Forum

All Questions      Topic List

None Questions

Previous in All Question      Next in All Question      

Previous in None      Next in None      

Question Number 4650 by FilupSmith last updated on 18/Feb/16

In mathematics I have worked with:  Σ and Π.  e.g.  Σ_(k=1) ^x k = (1/2)x(x+1)  Π_(k=1) ^x k = k!    I have never worked with ∐. I am curious  as to what it is. Is it another notation form?  Does ∐_(k=1) ^x k exist?

$$\mathrm{In}\:\mathrm{mathematics}\:\mathrm{I}\:\mathrm{have}\:\mathrm{worked}\:\mathrm{with}: \\ $$$$\Sigma\:\mathrm{and}\:\Pi. \\ $$$${e}.{g}. \\ $$$$\underset{{k}=\mathrm{1}} {\overset{{x}} {\sum}}{k}\:=\:\frac{\mathrm{1}}{\mathrm{2}}{x}\left({x}+\mathrm{1}\right) \\ $$$$\underset{{k}=\mathrm{1}} {\overset{{x}} {\prod}}{k}\:=\:{k}! \\ $$$$ \\ $$$$\mathrm{I}\:\mathrm{have}\:\mathrm{never}\:\mathrm{worked}\:\mathrm{with}\:\coprod.\:\mathrm{I}\:\mathrm{am}\:\mathrm{curious} \\ $$$$\mathrm{as}\:\mathrm{to}\:\mathrm{what}\:\mathrm{it}\:\mathrm{is}.\:\mathrm{Is}\:\mathrm{it}\:\mathrm{another}\:\mathrm{notation}\:\mathrm{form}? \\ $$$$\mathrm{Does}\:\underset{{k}=\mathrm{1}} {\overset{{x}} {\coprod}}{k}\:\mathrm{exist}? \\ $$

Commented by Yozzii last updated on 19/Feb/16

Commented by Yozzii last updated on 19/Feb/16

Category theory; source: wikipedia

$${Category}\:{theory};\:{source}:\:{wikipedia} \\ $$

Commented by Yozzii last updated on 19/Feb/16

Commented by Yozzii last updated on 19/Feb/16

Commented by FilupSmith last updated on 19/Feb/16

Very interesting!

$$\mathrm{Very}\:\mathrm{interesting}! \\ $$

Commented by 2closedStringsMeet last updated on 19/Feb/16

Awesome! Indeed very interesting.

$${Awesome}!\:{Indeed}\:{very}\:{interesting}. \\ $$

Answered by 2closedStringsMeet last updated on 19/Feb/16

it is likely the disjuntive sum operator.   Logical operator [or]...

$${it}\:{is}\:{likely}\:{the}\:{disjuntive}\:{sum}\:{operator}.\: \\ $$$${Logical}\:{operator}\:\left[{or}\right]...\: \\ $$

Commented by FilupSmith last updated on 19/Feb/16

I see. Thanks!

$$\mathrm{I}\:\mathrm{see}.\:\mathrm{Thanks}! \\ $$

Terms of Service

Privacy Policy

Contact: info@tinkutara.com