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If and only if - Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/If_and_only_if

In logic and related fields such as mathematics and philosophy, if and only if (shortened iff) is a biconditional logical connective between statements.

Mathwords: if and only if

www.mathwords.com/i/if_and_only_if.htm

iff if and only if Biconditional A way of writing two conditionals at once: both a conditional and its converse. For example, the statement "A ...

Logic -Biconditional IF AND ONLY IF

www.regentsprep.org/Regents/math/geometry/GP1/bicon.htm

A biconditional is read as "[some fact] if and only if [another fact]" and is true when the truth values of both facts are exactly the same

If, and Only If

zimmer.csufresno.edu/~larryc/proofs/proofs.ifandonlyif.html

Sometimes you can prove an "If, and Only If" assertion without explicitly dividng the proof into two parts. The next example illustrates how this might be done.

IF AND ONLY IF - University of Hawaii at Manoa

www.math.hawaii.edu/~ramsey/Logic/Iff.html

Some Uses of "if and only if" in Writing About Mathematics . Theorems which have the form "P if and only Q" are much prized in mathematics. They give what are called ...

Logical biconditional - Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/Logical_biconditional

In logic and mathematics, the logical biconditional (sometimes known as the material biconditional) is the logical connective of two statements asserting "p if and ...

Iff -- from Wolfram MathWorld

mathworld.wolfram.com/Iff.html

Iff. If and only if (i.e., necessary and sufficient). The terms "just if" or "exactly when" are sometimes used instead. iff is written symbolically as , , , or .

SubmissionsIf and Only If

www.ifandonlyifjournal.com/submissions

We are currently accepting submissions for our cover design contest. General submissions will reopen on Dec 1, 2015. General Guidelines. Poetry (up to 5 poems) and ...

Taxonomy of Proof: if and only if - Stanford University

www-cs-students.stanford.edu/~csilvers/proof/node4.html

The term ``if and only if'' is really a code word for equivalence. To prove a theorem of this form, you must prove that A and B are equivalent; that is, not only is B ...

If and Only If – A Journal of Body Image and Eating Disorders

www.ifandonlyifjournal.com

Disappearing Acts. by Luís Galvão. Like so many family stories, this one starts at the dinner table. My father’s not home, he’s at some political meeting, rally ...