A community for students.
Here's the question you clicked on:
 0 viewing
sara12345
 2 years ago
Logic
sara12345
 2 years ago
Logic

This Question is Closed

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0dw:1348907509327:dw

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0if 'a', then 'b' : a> b

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0is that correct ?.. can i write teh same as, only if 'b', then 'a' ?

badreferences
 2 years ago
Best ResponseYou've already chosen the best response.0Are you asking if you can reverse "if A, then B" to "if B, then A"?

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0no, the thing troubling me is "only if"

badreferences
 2 years ago
Best ResponseYou've already chosen the best response.0That doesn't sound right. "Only if" B still has many things that aren't A.

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0actually i dont get "if and only if", im trying to understand it by breaking it down to "if" and "only if"

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0may i knw why it doesnt sound right to you, it does sound right to me

badreferences
 2 years ago
Best ResponseYou've already chosen the best response.0But... a square is a kind of a rectangle.

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0dw:1348907860375:dw

badreferences
 2 years ago
Best ResponseYou've already chosen the best response.0"A square cannot be a rectangle"?

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0excuse me, my question is different, plz look at the diagram what im asking

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0only if its b, then only it can be a

badreferences
 2 years ago
Best ResponseYou've already chosen the best response.0"In Euclidean plane geometry, a rectangle is any quadrilateral with four right angles." "In geometry, a square is a regular quadrilateral. This means that it has four equal sides and four equal angles (90degree angles, or right angles)." So a square shares all the properties of a rectangle, but has the additional condition that it's regular. So all squares are rectangles.

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0a doesnt have any possibility outside b

badreferences
 2 years ago
Best ResponseYou've already chosen the best response.0No, but just because it's B doesn't necessarily mean it's A.

badreferences
 2 years ago
Best ResponseYou've already chosen the best response.0Replace A with "it rained last night" and B with "the grass was wet the next morning".

badreferences
 2 years ago
Best ResponseYou've already chosen the best response.0There are many ways for the grass to be wet the next morning (dew, sprinklers), even if it raining last night necessarily means that the grass is wet next morning.

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0@UnkleRhaukus you got me correctly! 3rd point in ur snapshot says it

badreferences
 2 years ago
Best ResponseYou've already chosen the best response.0Ahh, okay, the third point. I thought you were saying something else. My bad.

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0its okay... i dont get "if and only if" could you walk me through slowly plz

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0ive understood "only if" i guess, whats "if and only if", i mean i knw it means, a iff b is same as a>b, b>a

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0but why it is called "if and only if" is confuses me

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.2\[\begin{array}{ccccc}\phi&\psi&\phi\Rightarrow\psi&\phi \Leftarrow\psi&\phi\Leftrightarrow\psi\\ \hline \\T&T&T&T&T\\T&F&F&T&F\\F&T&T&F&F\\F&F&T&T&T\end{array}\]

badreferences
 2 years ago
Best ResponseYou've already chosen the best response.0Unkle, is it just me, or is "only if B then A" different from "A iff B"?

badreferences
 2 years ago
Best ResponseYou've already chosen the best response.0only if B then A is different from A if and only if B.

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0im familiar with xnor truth table, but still why its called "if and only if" should we break it into two : 1) if, 2) only if

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0a iff b break as : if a then b, a only if b ?

zzr0ck3r
 2 years ago
Best ResponseYou've already chosen the best response.0@sara12345 do you understand if a then b?

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.2if and only if \(\Leftrightarrow\) iff

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0yes, i understood iff also, only the "phrase" is confusing me

zzr0ck3r
 2 years ago
Best ResponseYou've already chosen the best response.0I think I'm confused about what your asking. Sorry.

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0sorry, like a iff b can i break it into 2 pieces : 1) if a then b, 2) a only if b ?

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0the two broken statements, do they cover completely "a iff b" ?

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.2these statements say the same thing 1) if a then b, 2) a only if b _______

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0ohh yea they say same thing, a>b

UnkleRhaukus
 2 years ago
Best ResponseYou've already chosen the best response.2to meant the same as a iff b switch the letters around in one of them

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0so hw can iu break it meanigfully

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0a "if and only if " b : a <> b a "if" b : b>a a "only if" b : a>b i guess now i have it working in above

sara12345
 2 years ago
Best ResponseYou've already chosen the best response.0i see there is lot of difference between, "if" and "only if"
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.