Theme is to topic as mls is to gls.
keywords: literary theory, literature, analogy

background / foreground
long run / short run
male / female
local / global
time / space
topology / algebra
existence / uniqueness
gls / mls
technical language / ordinary language
meta level / object level
organizational units / manifesting units
comedy / tragedy
mind / body
Mathematics / Language Arts
keywords: life, General Systems Theory, reciprocity

A case parallel to the situation of a double negative being negative is that a straight line that intersects both the negative portion of both the horizontal and vertical axes has negative slope.
keywords: Mathematics, Geometry, the coordinate plane

Besides the Morgenbesser retort, and the concept of ‘friendly fire’ (‘fire’ being a positive in the military context), there is the fact that a line (in the coordinate plane) that intersects the positive portion of both the horizontal and vertical axes has negative slope.
keywords: Mathematics, Geometry, the coordinate plane

Here is the link to a post that discusses this.
keywords: life, love, romance

Staying connected while apart: Esperanto is the Rolls Royce engine for doing this.
keywords: life, Language Arts, connectivity

Outside of a few absolutes, all answers are relative.
keywords: life, education, instruction, training, teaching, learning, study, curriculum

A (horizontal / vertical) line intersects the (vertical / horizontal) axis.
keywords: Mathematics, Geometry, the coordinate plane

investor: a teacher in the school of hard knocks.
keywords: life, no quarter given, quantitative analyst

Your lifestyle is no more sustainable than your literary effort is sustained. (cf: “Publish or perish.”)
keywords: life, General Systems Theory