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1. Logic maths of a relation
a. applying more narrowly than some other relation often given the same name, as strict inclusion, which holds only between pairs of sets that are distinct, while simple inclusion permits the case in which they are identical
b. distinguished from a relation of the same name that is not the subject of formal study
2. Botany rare very straight, narrow, and upright


A function f is strict in an argument if

f bottom = bottom

(See bottom). In other words, the result depends on the argument so evaluation of an application of the function cannot terminate until evaluation of the argument has terminated.

If the result is only bottom when the argument is bottom then the function is also bottom-unique.

See also strict evaluation, hyperstrict.
References in periodicals archive ?
They will join new tour host, 2015 Strictly semi-finalist Anita Rani, and the judging panel of Len Goodman and Craig Revel Horwood - who also acts as the tour's director - and former Strictly pro Karen Hardy.
Mel said yesterday: "I've been a huge fan of Strictly Come Dancing for many years, so am thrilled to be hosting the 2016 UK Live Tour.
I'm going to be filming Call the Midwife at the same time as Strictly so managing my time around both will be challenging.
He said: "What happens with billings is that we have a number of exchanges, so on Saturday week there's a Strictly Come Dancing launch show and a third X Factor audition show.
One name in the frame is Luba Mushtuk, a choreographer on the recent Strictly tour.
The hugely popular arena spin-off tour, Strictly Come Dancing Live, has just finished its 2018 run starring all of the finalists of the celebrity finalists from the 2017 BBC show.
It simply isn't true and the idea Shirley would hold a grudge or this has any impact on him being kicked off Strictly is laughable.
They will all be joined by more Strictly professional dancers, the Strictly singers and the Strictly live band when they arrive at the Metro Radio Arena in Newcastle on January 23 and 24 for three dance-packed shows.
Last year former Strictly celeb and Countryfile presenter Anita Rani took the role, which has previously been filled by Mel Giedroyc and Zoe Ball.
Media expert Prof Jonathan Shalit, chairman of talent management firm ROAR, believes big names have been put off by a fear of tripping up their careers: "People can also fall by the wayside on Strictly and it might be a bit of a risk if your career is going well and then you don't do well on the show.
Given he's in his 70s, some folk probably thought Len Goodman would waltz off to a relaxing retirement when he quit Strictly Come Dancing last year.