Greater than or Equal to

is a comparison function which tests whether the left argument is tolerantly greater than or equal to the right argument, returning 1 if this is the case and 0 otherwise. It is the negation of Less than, and in fact was called Not less in APL\360.

Boolean function
When the arguments to Greater than or Equal to are Boolean, it is the converse implication Boolean function:
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! !! !! ! ! In the context of logic, it can be read as is implied by.
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Documentation

 * Dyalog
 * APLX
 * J Dictionary, NuVoc
 * BQN