What does Al-lazm al-byn mean?

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Discover the meaning of the term Al-lazm al-byn (لازم البين) in Islamic vocabulary.

Definition Al-lazm al-byn

Al-lazm al-byn according to Kitab at-Ta'rifat (Al-Jurjani)

It is that whose conception, along with that of its implicate, suffices for the intellect to ascertain the entailment between them, such as the divisibility of four by two equal parts. Indeed, whoever conceives the number four and conceives division into two equal parts ascertains, merely by conceiving both, that four is divisible into two equal parts. It is sometimes said regarding the manifest implicate: that whose conception necessitates the conception of its implicate, such as the fact that two is the double of one, for whoever conceives two perceives that it is the double of one.

The first meaning is more general, because whenever the conception of the implicant suffices regarding the entailment, the conception of the implicate along with the conception of the implicant suffices. Thus the second meaning is called: the manifest implicate in the more specific sense, and not everything for which conceptions suffice is limited to the conception of a single thing, so this is called: the manifest implicate in the more general sense.

Al-lazm al-byn according to Maqalid al-'Ulum (As-Suyuti)

That whose conception, along with the conception of its implicate, suffices for the mind to ascertain the entailment between them.

Al-lazm al-byn according to At-Tawqif (Al-Munawi)

That whose conception, along with the conception of its implicate, suffices for the intellect to ascertain the entailment between them, such as the divisibility of four and the conception of division into two equal parts. Indeed, whoever conceives four and conceives division into two equal parts ascertains, merely by conceiving both, that four is divisible into two equal parts (Al-Ta'rifat, page 199).

Related terms: Al-lazm al-byn