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Probably acceptable where you live. Just be careful if you are over here. 
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Quote: In cryptography, a nonce is an arbitrary number that can be used just once in a cryptographic communication. It is similar in spirit to a nonce word, hence the name.
Which is a stupid fancy way of saying, your token isn't recognized!!! 
As to the word "invalid," I have always tried to not use that word, ever since I started "real" programming in my 20's. There are better words: "incorrect", "unrecognized", "wrong", "you're a shmuck!" etc.
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Marc Clifton wrote: "you're a shmuck!"
I have deserved that message more than once. 
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They already pulled that sort of stuff off in the 1970s. My first calculator at school was the original TI 30. We all had to get one and nothing else.
I have lived with several Zen masters - all of them were cats.
His last invention was an evil Lasagna. It didn't kill anyone, and it actually tasted pretty good.
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Yes, this was the gold standard, but it was well-priced. I have only had 2 legendary calculators - this one, and the HP-41C. Too bad they both got flooded in a major tropical system flood. 
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I have a 41C laying around. Many years ago it struck me, when I was filling in my tax return form, that I hadn't been using it since I was filling in the tax return form last year! And for summation it is really crazy to depend on a calculator! (Nowadays, we receive forms filled in with everything the tax authorities know of, which is more or less 'everything', already filled in, so there is no need to sum anything unless you have corrections to make.)
So I put it away. I've still got it. It requires batteries of a sizeno longer commonly available (you must go to electronics stores with a large battery section to find them), and I really haven't cared. I keep it as a museum item to show to kids - similar to my 1964 vintage Kodak Instamatic 50 camera and my 1968 vintage Kodak M14 Super-8 camera.
I am not willing to sell any of them. They were part of my childhood and teenage years. You don't sell your memories.
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trønderen wrote: I have a 41C laying around. Many years ago it struck me, when I was filling in my tax return form, that I hadn't been using it since I was filling in the tax return form last year! And for summation it is really crazy to depend on a calculator! (Nowadays, we receive forms filled in with everything the tax authorities know of, which is more or less 'everything', already filled in, so there is no need to sum anything unless you have corrections to make.)
You must not be in the USA, where the lawmakers want to make it as painful as possible to do one's taxes. That's OK - I still send in the paper form, and will continue to do so for as long as the tax prep programs require me to enter all the information from the forms (I wouldn't have a problem entering in the amount, but that's it! ). In any case, I like to have a running total throughout the year, as well as do simulations and other calculations (such as making sure certain levels stay low enough for me to get certain means-tested benefits), so I have set up my own spreadsheet with only those lines that are pertinent to my situation; as the tax rules typically hardly change at all, the new year is just a copy of the previous year's spreadsheet with entered items just being deleted, except for ongoing (non-retirement) liquid investments, for which I keep the purchase info.
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The worst part is, after school you'll never use it again 
I've used mine for four years I think, got a simpler one before that.
I still have it, but never used it again after school.
Also, isn't there an app that does the same?
Sounds not too hard to make if you're into programming and fairly sufficient at math.
I mean, most functions are already provided by languages/frameworks, you just need to visualize it and there are plenty of plotting libraries already available.
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Mine is buried somewhere in a box after the move to our new house, never felt the need to dig it up again!
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I read "xbox" and was very confused
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I still occasionally use my school-days Faber Castell slide rule. It's quite useful for 'What if...' kinds of calculations.
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Night at the Museum!
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I still have my slide rule from high-school days. I recently took it out to show my daughters what life was like BC (Before Calculators).
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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I wrote some of my very first programs on a TI-56 calculator. I think this was before they came out with the graphing calculators that become so common.
"They have a consciousness, they have a life, they have a soul! Damn you! Let the rabbits wear glasses! Save our brothers! Can I get an amen?"
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AFAIK in Germany (NRW to be precise) it was (or a specific TI Calculator) the only type allowed to be used in the Abi (Final exams) and all of the course material was based around the TI Model. As a parent you were not "Forced" to buy one, but if all of the materials use it, only that type can be used in the Finals exams, then you have no choice ....
Pretty clever marketing.... it not exaclty moraly sound... but hey... were money is concered its very rare that morals are anywhere in the vicinity
Who the f*** is General Failure, and why is he reading my harddisk?
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Here, in India, we use Casio, which are available for less than $ 10.
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I don't think I ever used a TI calculator, not even back in the 70s.
I have a Casio calculator I bought in the late 80s.
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What's wrong with drawing a graph with a pencil? Back in the 70's we had two choices - HP or TI - for scientific calculators. Both were expensive ($400) but the HP was immeasurably better in quality and functionality, not to mention the much superior efficiency of RPN notation for complex calculations. Even with all that power under the hood, we still had to draw dots on paper and connect them with a pencil. It didn't hurt a bit.
I've tutored kids who have been through these classes. They can't do math; all they know is how to run a fancy calculator. What a waste of a generation, but it was brilliant marketing by TI. Back in the 70's they were equally brilliant; they gave away their databooks and application notes to engineering students, while all the other companies charged outrageous prices for theirs. Guess whose part numbers and specs those students had memorized when they entered the workforce and started designing products?
Will Rogers never met me.
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Roger Wright wrote: What's wrong with drawing a graph with a pencil?
In my time in college, only with paper and pencil would have been possible, but you would have never finished all the exercises in the time given for the exam. So... if you wanted to have a chance, you had to buy one too, but I was not "forced" to buy one of TI. I had a programable casio with 300k memory or so (IIRC)
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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With all due respects, I must disagree.
All you need for a decent freehand graph are the inflection points, the asymptotes, and some idea about the behaviour around x = 0. You can draw a very nice freehand graph with those data.
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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Í have never said it is not possible.
I said that without the electronic help you would have no time to finish the excercises. Not the same.
I had some times where even knowing what I was doing and having my casio (no graphics though) I was damned "just in time" to give my exam.
M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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A $100 calculator to go with their $900 phone? If the cases match, why not.
I'm guessing it could run Linux.
It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it.
― Confucian Analects: Rules of Confucius about his food
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