Conditional Indicators Flashcards by Wang Kai | Brainscape

Q

if

A

Sufficient

A → B

Contrapositive

if what?

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Q

when(ever)

A

Sufficient

A → B

Contrapositive

when(ever) what?

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Q

any(time)

A

Sufficient

A → B

Contrapositive

any(time) what?

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Q

all

A

Sufficient

A → B

Contrapositive

all what?

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Q

every(time)

A

Sufficient

A → B

Contrapositive

every(time) what?

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Q

in order to

A

Sufficient

A → B

Contrapositive

in order to what?

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Q

people who

A

Sufficient

A → B

Contrapositive

people who what?

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Q

each

A

Sufficient

A → B

Contrapositive

each what?

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Q

then

A

Necessary

A → B

Contrapositive

then what?

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Q

must

A

Necessary

A → B

Contrapositive

must what?

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Q

necessary

A

Necessary

A → B

Contrapositive

what’s necessary?

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Q

required

A

Necessary

A → B

Contrapositive

what’s required?

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Q

only (if)

A

Necessary

A → B

Contrapositive

only (if) what?

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Q

depends

A

Necessary

A → B

Contrapositive

depends on what?

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Q

need (to)

A

Necessary

A → B

Contrapositive

need (to) what?

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Q

have to

A

Necessary

A → B

Contrapositive

have to what?

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Q

essential

A

Necessary

A → B

Contrapositive

what’s essential?

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Q

precondition

A

Necessary

A → B

Contrapositive

what’s the precondition?

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Q

and

A

And/Or/Neither-Nor

A + B → C (vertical)

Contrapositive

Q

or

A

And/Or/Neither-Nor

A → B or C (vertical)

Contrapositive

Q

neither… nor…

A

And/Or/Neither-Nor

=not this and not that:
A → ~B + ~ C (vertical)

Contrapositive

Q

if and only if

A

If and Only If (Together)

double must arrow: ↔

Contrapositive: A ↔ B = ~A ↔ ~B

Q

if but only if

A

If and Only If (Together)

double must arrow: ↔

Contrapositive: A ↔ B = ~A ↔ ~B

Q

all and only

A

If and Only If (Together)

double must arrow: ↔

Contrapositive: A ↔ B = ~A ↔ ~B

Q

but not otherwise

A

If and Only If (Together)

double must arrow: ↔

Contrapositive: A ↔ B = ~A ↔ ~B

Q

when and only when

A

If and Only If (Together)

double must arrow: ↔

Contrapositive: A ↔ B = ~A ↔ ~B

Q

Either…. or….

A

Either/Or (Inclusion)

~A → B

Contrapositive

Q

no

A

No (Exclusion)

A → ~B

Contrapositive

Q

none

A

No (Exclusion)

A → ~B

Contrapositive

Q

nobody

A

No (Exclusion)

A → ~B

Contrapositive

Q

never

A

No (Exclusion)

A → ~B

Contrapositive

Q

unless

A

Unless (Exception)

~A (if not normal) → B

Contrapositive

Q

except

A

Unless (Exception)

~A (if not normal) → B

Contrapositive

Q

until

A

Unless (Exception)

~A (if not normal) → B

Contrapositive

Q

without

A

Unless (Exception)

without = unless I have

~A (if not normal) → B

Contrapositive

Q

some

A

Some (Partial)

A ←s→ B

-

Q

few

A

Some (Partial)

A ←s→ B

-

Q

many

A

Some (Partial)

A ←s→ B

-

Q

at least one

A

Some (Partial)

A ←s→ B

-

Q

several

A

Some (Partial)

A ←s→ B

-

Q

not all

A

(fancy some)
Some (Partial)

=some are not:
A ←s→ ~B

-

Q

most

A

Most (Partial)

A -m→ B

A ←s→ B

Q

usually

A

Most (Partial)

A -m→ B

A ←s→ B

Q

probably

A

Most (Partial)

A -m→ B

A ←s→ B

Q

mostly

A

Most (Partial)

A -m→ B

A ←s→ B

Q

more often than not

A

Most (Partial)

A -m→ B

A ←s→ B

Q

if not both

A

And/Or/Neither-Nor

~ A or ~ B —> C

Contrapositive

If A and B does not both occur, then C.
=
If not A or not B, then C.