# What is Cas: Definition and 41 Discussions

Calcium sulfide is the chemical compound with the formula CaS. This white material crystallizes in cubes like rock salt. CaS has been studied as a component in a process that would recycle gypsum, a product of flue-gas desulfurization. Like many salts containing sulfide ions, CaS typically has an odour of H2S, which results from small amount of this gas formed by hydrolysis of the salt.
In terms of its atomic structure, CaS crystallizes in the same motif as sodium chloride indicating that the bonding in this material is highly ionic. The high melting point is also consistent with its description as an ionic solid. In the crystal, each S2− ion is surrounded by an octahedron of six Ca2+ ions, and complementarily, each Ca2+ ion surrounded by six S2− ions.

View More On Wikipedia.org
1. ### Which CAS use multiple representations for mathematical objects?

How do various computer algebra systems (CAS) compare with respect to keeping multiple representations of the same mathematical object? For example, a polynomial could be represented by a list of coefficients, or a list of roots, or a list of factors with some factors non-linear. One design...
2. ### I Solving a System of Nonlinear Equations Symbolically

Hi. I would like to use a CAS to solve systems of nonlinear equations symbolically. The JavaScript library Nerdamer can solve single nonlinear equations symbolically shown here, and I would like to use that function iteratively to solve systems. For example, if I have a system of three equations...
3. ### B Need someone with some good CAS

Trying to figure out how to model a rocket, and I got some pretty decent flight formulas. The only thing i need is to calculate how fast the masse is expelled. Found an article: (https://www.researchgate.net/publication/253753714_Analysis_of_a_water-propelled_rocket_A_problem_in_honors_physics)...
4. ### Using Maxima to plot error in Fourier series

I'm trying to use Maxima to examine the error in a Fourier series as the number of terms increases. I've figured out how to produce a Fourier series and plot partial sums, but this has me stumped. If anyone experienced with the Maxima CAS has some insight into this, I would greatly appreciate...
5. ### Calculators RE- TI Nspire CX CAS vs Casio Classpad vs TI 89

HI y'all! I was just told by my programming teacher that I need a new graphing calculator. She told me to decide between the TI 89, Casio Classpad fx-cp400 (or fx cp500) or the TI-Nspire CX C.A.S. I don't know if greyscale or color matters though in the long run. I am a programmer and need...
6. ### Programs for thermodynamics calculations

I know these calculations in thermodynamics can be done by hand or a simple calculator but I wonder if some programs do these calculations. These programs might be called multiphysics programs. An example of a calculation - select piston-cylinder arrangement. -enter initial...
7. ### CAS and Numerical Computing

Until now, I have always think of Matlab as CAS but now I know that it is not. So how do you understand this? Thank you.
8. ### Do I need Mathematica or a CAS graphing calculator?

Hello Everyone. I'm returning to college to earn a degree in physics 15 years after getting a BA in English. I took calculus almost 20 years ago and used a Ti 85. I've noticed that some graphing calculators have CAS integrated, which I've never used, and I'm keen to get one for my physics and...
9. ### Calculators Ti-nspire cx cas search function?

Is it possible to search for a word on a document after I have sent it to my ti-nspire cx cas calculator?
10. ### TI Nspire CX CAS vs HP Prime vs Casio FX-CP400

Hello everyone. I am going to be purchasing a good graphing calculator soon. That being said, I will hopefully be going to college to get a degree in aeronautical engineering. So what do you all think is the best of those calculators? I have been leaning towards the Casio CP400 because of the...
11. ### Anybody else dependent on a computer algebra system (CAS)?

HI all, I am working my way slowly through some classical mechanics books, and I don't think I could function without my CAS (most often my trusty HP 50g, sometimes Giac/Xcas). I have never been very good at pages of algebra, often dropping negatives or whatever, bad enough that working...
12. ### MHB Graphing Equations with x, y, and z on the TI-Nspire CX CAS

how do i graph z=1-y^2 or x=y^2+4z^2 or 36x^2+y^2+36z^2=36 or pretty much anything with x,y,z on the ti nspire cx cas
13. ### MHB Plotting points on ti nspire cx cas

how would i plot points in 3D on the ti nspire cx cas? like these 3 for example: (-4,0,-1), (3,1,-5), (2,4,6)
14. ### MHB Using the General Series Command on Nspire CX CAS

How to use generalized series command on to nspire CX cas
15. ### MHB Direction fields on ti nspire cx cas

anyone know how to do it? how to graph differential equations along with the slope/direction field? (Wondering)
16. ### MHB Graphing y'=y-x+1 on TI Nspire CX CAS

how do i graph y'=y-x+1 on ti nspire cx cas.
17. ### Calculators Transplanting TI-nspire CAS motherboard to CX

My CAS screen cracked. Can I move the CAS motherboard to another CX I have?
18. ### TI Nspire CX CAS question

Hello, I have a question about if it is possible to get interval notation on the TI Nspire CX CAS. If so how do you do it? Thank you
19. ### Graphing diff eq slope field with TI Nspire CX CAS HELP please ?

Graphing diff eq slope field with TI Nspire CX CAS HELP please!? Every time I try to graph a slope field an error message pops up saying 'wrong number of initial conditions'. What does this mean? I tried graphing equations like dy/dt = t^(2) + t or dy/dt = 1-2y but I keep getting that dumb...
20. ### MHB TI-Nspire CX CAS normal distribution graph

I am trying learn how to graph Normal distribution with TI-Nspire CX CAS went to the Ti.com but just found a work sheet. or else I missed it some where. but saw some examples on the display. thanks ahead for help:cool:
21. ### Latent Heat of CAS No. 4719-04-4

I'm hoping someone can help me find information on this, I've been searching to no avail for it. I need to know the latent heat of 2, 2', 2" (Hexahydro-1,3,5-triazine-1,3,5-triyl)triethanol CAS No. 4719-04-4 at P = 480 Psig, T = 150°F. Can anyone point me in the right direction for some info...
22. ### Calculators TI-89 Titanium or TI-Nspire CX CAS?

Hi. So, for the first time my younger sibling will need a graphing calculator for their classes so I'm giving them my TI-84 Plus and getting myself a new, better one. Right now I'm a Junior in high school taking ap-chemistry, ap-physics and ap-calculus AB. Next year I'll be taking calc BC (my...
23. ### Calculators Calculate Phasors with TI CX CAS & TI 89: A Comparison

Hi guys Can I calculate phasors in a ti cx cas as simple like in a ti 89. In a few days I will need to calculate them in a test, so I need to buy a ti nspire cx cas or ti 89. I think ti inspire cx cas can manage ecuaciones with complex like 89 does, but I can't find how to calculate phasor...
24. ### Calculators Is the TI Nspire CX CAS Worth Upgrading to for Electrical Engineering?

Hi. I'm going to university in a month to study Electrical Engineering.I already have an TI83 + , but I'm thinking of upgrading to a TI 89 or TI Nspire CAS CX because they both have CAS. Now from what I've read on the Internet the Nspire CAS seems better because of the higher resolution color...
25. ### Calculators Calculator suggestions (nSpire CAS?)

Hi all - couldn't find another suitable place to post this on the Internet... My TI92 died last week after 15 years of use (OK I killed it with coffee), and I thought I'd just try and get by with Wolfram Alpha but it's just clunky and horrible. I'm currently using my spare TI86 which lacks a...
26. ### Calculators How do you plot y'=3+2y on a TI-Nspire CX CAS?

Hi, I'm new here. I did some research plotting the ODE of y'=3+2y without having x shows up in the equation. I can't figure it out, why the calculator does plot a harder equation but not a simple one? I can get the slope field with an equation that has an x in it. However, without x, my...
27. ### How do CAS evaluate derivatives

How do CAS systems and programmable calculators evaluate the derivative of a function? Do they use matrix representation of linear transformations?
28. ### Calculators Anyone have the TI-Nspire CX CAS?

Anyone have the new TI calculator? My 89 is working perfectly, but it's so freaking slow in graphing the simplest surfaces. My only concern is the battery life. TI claims this new color doo-dad will last 2 weeks between charges. Provided that is true, that would mean that I would probably...
29. ### Mathematica List of CAS: Mathematica, Maple

Hello All, I would like to ask about experience in general math as well as general engineering software. At university time we used in different departments 1. Mathematica http://www.wolfram.com/ + add on http://www.fgg.uni-lj.si/Symech/ 2. Maple http://www.maplesoft.com/ + add on Mechanics of...
30. ### TI TI Nspire CX CAS How do I input full fractions and 84-Plus mode?

I have been trying to figure out how to plot a differential equation using my TI Nspire with very little luck. I managed to find that I can set the graph of the calculator to a directional field but I am not 100% sure I am getting the right results. So I figured I would ask to see if anyone here...
31. ### Calculators Newb with a TI-npire CX CAS

I'm taking an online "Elementary Algebra" class from my local community college. It's been a few years since I graduated high school and I've forgotten pretty much everything; including my T-84 Silver, which I never took full advantage of its potential anyway. So I went out and got myself a new...
32. ### How to transfer text file from PC to TI nspire CAS

How can i transfer a text document (word, pdf or text file) from PC to TI nspire CAS. I am lost and need help. I have install TI software on my PC. Thank you in advance for any help you can provide.
33. ### Calculator Inuts: DAL vs. RPN vs. CAS

Calculator Ipnuts: DAL vs. RPN vs. CAS Hi all, I'm just wondering what calculator input methods are commonly used while learning advanced maths such as engineering/scientific maths. I have just got the hp i41cx+ iPhone application, and while I can appreciate the advantages RPN input, I...
34. ### Maxima CAS question re: forcing evaluation

I'm wondering if anyone knows how, using the Maxima CAS, to force the evaluation of an expression? For example, if a function returns something like the following as a solution: -\frac{{2}^{\frac{6}{4\,log\left( 2\right) -5}+2}-5\,\left( \frac{6}{4\,log\left( 2\right) -5}+2\right) }{log\left(...
35. C

### Is it considered lame to use a CAS when helping people in the DE forum?

Hi there, Many of the problems on this part of the forum simply boil down to "I don't know how to solve the ODE: <some strange ODE here>" I kind of forgot how to solve many of these problems myself, so I've just been giving people the answer from matlab's dsolve function. Is this...
36. ### Cas bugs in the evaluation of the logarithm?

hi, can you evaluate ln(f(x)) in your favorite cas (where x is a zero of f(x) )? what is the result?
37. ### Functional Equation (Probably needs a CAS)

Homework Statement If f'(x)>0 for all real positive x, where f:R+ ---> R and f(x)+(1/x)=f-1(1/(f(x))), f-1(1/(f(x)))>0 for all x>0. Find all the possible values of (i) f(2),(ii) f'(2) and (iii) Limit (x f(x)) as x ----->0 . The Attempt at a Solution Guessing from the last...
38. ### CAS that handles error terms?

I was wondering if there was a computer algebra system (like Math'ca, Maple, or Maxima) that could handle manipulations with big O error terms. Mathematica has an O function, but it doesn't work properly: > x^2 Log[x] + x Log[x]^2 + x / Log[x] + O[x] O[x^1](it should be "x^2 Log[x] + x...
39. ### Multivariable limits with CAS

Homework Statement I would like to be able to compute multivariable limits with a CAS. I have Mathematica, Derive and an HP 50g. For example, how would I compute: \lim_{(x,y)\rightarrow(0,0)}\frac{x^2}{y} Homework Equations The Attempt at a Solution On Mathematica I tried: Limit[x^2/y, {x, y}...
40. ### Calculators Comparing TI-Nspire CAS+ vs. Regular CAS

Hello guys, I just bought TI-Nspire CAS+ graphing calculator, and I am wondering what are the differences between CAS+ and normal CAS. What are pros and cons? Thanks in advance, Jan
41. ### MATLAB Advice on Choosing a CAS - Mathematica, Maple, Derive, Matlab

I'm planning to learn a CAS. Can you guys give me advice on what I should choose (Mathematica, Maple, Derive, Matlab, or maybe others)? Thanks a lot.