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What (who) is cylindrical extension - definition

MAP PROJECTION

Miller projection; Miller cylindrical; Miller Cylindrical; World Miller Cylindrical; Miller cylindrical map projection

Group extension

GROUP FOR WHICH A GIVEN GROUP IS A NORMAL SUBGROUP

Extension problem; Extension (algebra); Split extension; Extension of a group; Central extension (mathematics)

In mathematics, a group extension is a general means of describing a group in terms of a particular normal subgroup and quotient group. If Q and N are two groups, then G is an extension of Q by N if there is a short exact sequence

https://en.wikipedia.org/wiki/Group_extension

Extension (metaphysics)

THE PROPERTY OF STRETCHING OUT OR TAKING UP SPACE

Physical extension

In metaphysics, extension signifies both 'stretching out' (Latin: extensio) as well as later 'taking up space', and most recently, spreading one's internal mental cognition into the external world.

https://en.wikipedia.org/wiki/Extension_(metaphysics)

Field extension

PAIR OF A MATHEMATICAL FIELD AND ITS SUBFIELD

Subfield (mathematics); Quadratic extension; Purely transcendental; Extension field; Quadratic field extension; Degree (field theory); Subextension (field theory); Trivial extension; Intermediate field; Adjunction (field theory); Extension of a field; Finitely generated field extension; Purely transcendental extension; Field Extension; Finitely generated extension; Subextension; Cubic field extension; Cubic extension; Transcendental field extension; Adjoining (field theory)

In mathematics, particularly in algebra, a field extension is a pair of fields E\subseteq F, such that the operations of E are those of F restricted to E. In this case, F is an extension field of E and E is a subfield of F.

https://en.wikipedia.org/wiki/Field_extension

Wikipedia

Miller cylindrical projection

The Miller cylindrical projection is a modified Mercator projection, proposed by Osborn Maitland Miller in 1942. The latitude is scaled by a factor of 4⁄5, projected according to Mercator, and then the result is multiplied by 5⁄4 to retain scale along the equator. Hence:

or inversely,

where λ is the longitude from the central meridian of the projection, and φ is the latitude. Meridians are thus about 0.733 the length of the equator.

In GIS applications, this projection is known as: "ESRI:54003 – World Miller Cylindrical".

Compact Miller projection is similar to Miller but spacing between parallels stops growing after 55 degrees.

https://en.wikipedia.org/wiki/Miller cylindrical projection