math 1081 discrete (1 Viewer)

[cyrax83]

help the lecturer moves so fast omg .. i need help with this subject in lamens terms

 

[underthesun]

same.. let's start with q12 in the question set:

A U C (is a subset of) B U C
U is the union thingy, and ^ is the intersection thingy for now

A ^ C (is a subset of) B ^ C

now they want you to prove that A (is a subset of) B..

im trying to do it, but its confusing...

 

[McLake]

Isn't it fun?

*Looks for answer*

Take "E" to mean "is an element of"
Take "~" to mean "is not"
Take "<" to mean "is a subset"

Let x E A (1)
so x E A U C (2)
so x E B U C (3)

2 cases:

if x E C
then x E A ^ C (1)
so x E B ^ C (given statement)
so x E B

or x ~E C
and x E B U C (3)
then x E B

so in either case, x E B
so A < B

 

[Dash]

Originally posted by cyrax83
help the lecturer moves so fast omg ..(

Yeh I heard about that guy...
I ALSO heard that like half the people left that lecture halfway or something

 

[mp3mojo]

Originally posted by McLake
Isn't it fun?

*Looks for answer*

Take "E" to mean "is an element of"
Take "~" to mean "is not"
Take "<" to mean "is a subset"

Let x E A (1)
so x E A U C (2)
so x E B U C (3)

2 cases:

if x E C
then x E A ^ C (1)
so x E B ^ C (given statement)
so x E B

or x ~E C
and x E B U C (3)
then x E B

so in either case, x E B
so A < B

amazing that u still remember ur discrete
now lets show them some finite!!

 

[kouri]

see..told you we can rely on our seniors haha..

and i dont wanna know about finite. !~>_<~

 

[mp3mojo]

oh cum on Kouri, let me give u a taste of finite hehee (jus to scare u off!!)
is 9183247823749833 a prime number?

 

[redslert]

come on that's a 50/50 question
lol

i'll say true!

 

[underthesun]

looks like a nice solution to me .

Originally posted by mp3mojo
oh cum on Kouri, let me give u a taste of finite hehee (jus to scare u off!!)
is 9183247823749833 a prime number?

See, the nextprime function in maple will be good for this

 

[anti]

Oh I didn't do finite

 

[McLake]

Originally posted by anti
Oh I didn't do finite

Be glad ...

 

[mp3mojo]

btw im not answerin dat Q hehee
ull find out how to do it in finite maths! - sumthin 4 u to be excited about

im not answerin it, cos its a LONG process... simplifyin the number so its a multiply of other numbers... using these theorems... errr....

 

[anti]

I might appreciate it in crypto though! And maybe this DSS thing.

 

[Weapon-X]

who is the lecturer???


is it john steele first or jie du first??

 

[underthesun]

Jie Du first.. and we're having him again this week.

Who's stricter? I was always under the impression that chinese teachers are always stricter than others..

 

[McLake]

Originally posted by underthesun
Jie Du first.. and we're having him again this week.

Who's stricter? I was always under the impression that chinese teachers are always stricter than others..

Actually, I would say that Steele is. J Du dosn't really care about mobiles going off, but Steele does ...

 

[underthesun]

haha I had the feeling that he is. Just by looking at his name

"Steele. John Steele."

 

[sunny]

Originally posted by McLake
J Du dosn't really care about mobiles going off

"very easy yeh? very easy very easy....."

 

[cyrax83]

any 1081 gurus want to teach a noob ?

 

[mp3mojo]

Jie Du was actually quite funny. I still remember him asking, if the following is true? if 1 = 2, then im a monkey's uncle