Englishfor English speakers
preservation
Noun
—
Preservation means the act of something, to protect it and prevent damage or destruction from happening to it.
of
Preposition
—
Made using.
It is a house of cards.
homotopy
noun
—
(topology) A continuous deformation of one continuous function to another.
—
(topology) A theory associating a system of groups with each topological space.
—
(topology) system of groups associated with a topological space