Petanquell

The frequency of tenes are on each instrument the same. For example, the frequency of "A" is something about 446 Hz. (musical instruments are sometimes "harmonised" by pitchfork (Gabe, please explain how it works, i can't do it ) Try google, but the point is that each "A" played on guitar, piano, marimba or something has the same frequency. The diffrence of sound is in Czech called "tone color" and I really don't know what causes that...

Very good point! My bad, I didn't expect that someone could have so suicidical behaviour! As usual my fault, I haven't read them carefully. Next time, I'll rather write off all warnings despite they seems obvious to me. Pq

[math] Z^+_0 [/math] is not enough for line

if [math] t\in N [/math] it won't be a line but dots (on points, don't know how to say it)... The second thing, we talked about it three days ago. Visit math tutor, paragraph about "Transformations". There is quite nice metaphore (I know you like them ) .... See you in half an hour at the teaplace, pq

A much bigger shindy makes heated flour on high tempreature. Anyway, a beautiful explosion can be made with a few oil (about 1 liter) heated on fire to high tempreature (as high as you can) and when first flames appear(, count to three and) pour a cup of water into and run very fast away.(when I saw it at first it was an accident ) for more inspiration watch MacGyver

I'm not sure as always, but i think we've learned it as [math] f(x) = \frac{2}{\pi}\arctan(x) + \frac{1}{2} , Df=(0;1)[/math] , toff.

I don't have a cat but I've got fish and they are probably the best animals to show how animals feel time. It wasn't my idea but I tried it anyway. I fed them every day at the same time (only once a day, at 5 o'clock ) in the same corner of the aquarium and after a pretty short time, they were waiting in that corner only a few minutes before five o'clock. I don't have big aquarium but i'm sure, they were waiting.

oh, my mistake many thanks guys

[math] (-1)(\sqrt{-1})\neq\sqrt{(-1)(-1)(-1)} [/math] because [math] \sqrt{a^2}=\left|a \right| [/math] aspon myslim...

The question is, how can be [math] \frac{x^2-4}{x-2} [/math] equal to 4 when the "range of the fraction" is [math] \left(\infty;4 \right)\cup \left(4;\infty \right) [/math] ?

Is the exponent defined by a function?

I'm not sure, if it is a senceful question but... I always get angry when someone write something like [math] \lim_{x \rightarrow 2 }\left(\frac{x^2-4}{x-2} \right) =4 [/math] because it's not equal ,it approximates, it's "almost equal". I know, it's mathematicly correct, but something's telling me that the equality is not the best symbol for this. The question is if the "4" on the right represents number or constant function (and my opinion is it should end in this [math] \lim_{x \rightarrow 2 }\left(\frac{x^2-4}{x-2} \right) =\lim_{x \rightarrow 2 } (4) [/math] formula without other editing, if it is a function...) and if that "4" is a real number, why is there equality while that fraction is undefined at 2? many thanks Pq