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#10476 Re: Exercises » Inequality In [1;3] » 2011-07-18 01:56:17

hi Thanh Vân

i tried to find the maximum value of the left part which is for a=b=c=3 and equals (3√2)/2, and the minimum value of the right part which is for a=b=c=1 and equals (9√2)/2 ,so for any other possible values for a,b and c the inequality will always be true.i think this is not the prefered method for solving this kind of problems but it is the only one i could come up with.

#10478 Re: Exercises » question about how to determine Tautologies, Contradictions & Continge » 2011-07-06 09:57:16

hi iwan_ccie

there are several ways to determine if a proposition is a tautology or a contradiction.
the easiest one is to make a table,make columns for all the boolean variables and then plug them into the equation and if the equation is always true then it is a tautology,and if it is always incorrect than it is a contradiction.
the other one works only when you have to prove that it is a tautology.it is called reductio ad absurdum.

#10479 Re: Exercises » question about how to determine Tautologies, Contradictions & Continge » 2011-07-06 09:49:12

hi iwan_ccie

first one is a contradiction

second one is a contradiction

third one is a tautology

fourth one is contingent

and the fifth one is also contingent.

#10480 Re: Help Me ! » Exponents and Scientific Notation » 2011-07-06 04:44:03

hi zee-f

that is incorrect.how did you get that answer?

#10482 Re: Help Me ! » Exponents and Scientific Notation » 2011-07-06 04:33:37

hi zee-f

yes that is correct,but try to get a power of ten in the numerator.

#10483 Re: Help Me ! » questions about elements in sets ... » 2011-07-06 04:23:21

hi iwan_ccie

your welcome.glad you understood.

#10484 Re: Help Me ! » LaTeX editors » 2011-07-06 04:18:03

hi  bobbym

thanks for the link,but i am looking for an offline editor,so to say.

#10485 Re: Help Me ! » questions about elements in sets ... » 2011-07-06 04:14:51

hi iwan_ccie and bobbym

here's the stuff you need from the link bobbym mentioned in his post:
" For example consider the set B = {1, 2, {3, 4}}. The elements of B are not 1, 2, 3, and 4. Rather, there are only three elements of B, namely the numbers 1 and 2, and the set {3, 4}."

#10486 Help Me ! » LaTeX editors » 2011-07-06 04:13:08

anonimnystefy
Replies: 6

hi all,

Lately i have been interested in finding an editor for LaTeX that i could write LaTeX and also print it or something like that.Can anybody tel me about such programs?

#10487 Re: Help Me ! » questions about elements in sets ... » 2011-07-06 04:07:37

hi iwan_ccie

the elements you counted are subsets and subsubsets of our set but they are not counted as elements of our set.

#10488 Re: Help Me ! » questions about elements in sets ... » 2011-07-06 04:03:52

hi iwan_ccie

the given set has two elements:

one of them is 9,
the other one is the set {1,2,{3},{4,5},6,{{7},8}}

#10493 Re: Exercises » Question about a "closed walk" in a graph » 2011-07-05 09:10:48

hi iwan_ccie

a closed walk is only when the first and the last letter are the same.
an allowed walk is the one that includes a vertex that is unmarked on your image.

your welcome.

#10494 Re: Exercises » Question about a "closed walk" in a graph » 2011-07-05 08:03:00

hi iwan_ccie

this is a kind of question i don't encounter very much.where did you get this?

as for the question itself if the route ABCDEBA is considered closed and allowed than so should it be ABCBA.

#10498 Re: Dark Discussions at Cafe Infinity » Wink Murder 12? » 2011-07-03 23:27:11

well i would certainly like to play but unfortunately i can't PM

#10499 Re: Help Me ! » Solving systems of equations using Substitution method and elimination » 2011-07-03 09:05:08

hi zee-f

for 16 it is not f

hi bobbym

yup that's what i'm getting

#10500 Re: Help Me ! » Solving systems of equations using Substitution method and elimination » 2011-07-03 09:00:37

hi bobbym

you're right,i'm getting closer to 0.42 for the peanut part

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