compulsory

Examples of obligatory

obligatory
The underlying dynamics of sibling relationships have been identified as balanced reciprocity, optional rather than obligatory exchange of support and the maintenance of personal autonomy.
To suppose that all formally valid laws are morally obligatory is a moral error.
Partial effects can be interpreted in terms of mutual (de)stabilization rather than obligatory inclusion.
Under most circumstances, few would expect an obligatory relationship between the activation of some eccentric retinal ganglion cells and the initiation of an eye movement.
The language exhibits obligatory subject-verb agreement, two pronominal genders (animate and inanimate), and morphologically marked tense-aspect, postpositions, definitization, and pluralization.
He was in favor of obligatory instruction for children because he feared that otherwise parents would exploit them.
Quite obviously though, this is not an explanation ; the question was, why is coreference obligatory in these constructions.
Take is usually a transitive verb, yet although it has an obligatory direct-object argument, locative arguments are normally optional.
Incidentally, all this seems to indicate the special status of tense with respect to recoverability as the obligatory recovery in (15) above suggests.
As discussed above, a corollary of a trigger-centered theory of movement is that any movement is by definition obligatory.
The object agreement marker, then, seems to be obligatory, while the subject marker is not.
They might insist, that is, that there are only negative duties and permissions, so that all acts of aid are supererogator y, not obligatory.
Nonetheless, this is a great book that should be obligatory reading for comparativists interested in authoritarian regimes and transitions to democracy.
Such contrasts make the volume excellent teaching material and it will also be obligatory reading for scholars.
While belief reassessment and epistemic peer conflict resolution are epistemically valuable and even obligatory for many exclusivists, why think that they are so for all?
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