Answered: TASK 2.4 Implement the missing code…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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TASK 2.4

Implement the missing code for the method specialize(specialization_map)
of class InferenceRule, which returns the specialization of the inference rule according to the given specialization map.

#: A mapping from variable names to formulas.
SpecializationMap = Mapping[str, Formula]
...
class InferenceRule:
...
def specialize(self, specialization_map: SpecializationMap) -> \
InferenceRule:
"""Specializes the current inference rule by simultaneously substituting
each variable name `v` that is a key in `specialization_map` with the
formula `specialization_map[v]`.
Parameters:
specialization_map: mapping defining the specialization to be
performed.
Returns:
The resulting inference rule.
"""
for variable in specialization_map:
assert is_variable(variable)
# Task 4.4

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