Consider :

Reductionism :

An attempt or tendency to explain a complex set of facts parsing another, simpler set: “Science requires some degree of reductionism, some picking apart and focusing on one or two variables at a time” (Natalie Angier).

OR: Ockham’s

razor n. A rule in philosophy stating that entities should not be multiplied needlessly. (Not just by counting). What is the main reason behind making an explanation to what is already known? Also called law of parsimony.

(Philosophy) Maxima, attributed to William of Ockham, stating that in explaining something assumptions must not be needlessly multiplied. Which are called the principle of

economy.

Amallamaty?

To combine to form one structure or organization with another.

(By combining two entities to form one unit, the units are as one, the units are equal). to combine to form a structure or organization with another.

Let’s get down to the details. Let’s just get down to the nub.

Essence

SYNONYMS quintessence, soul, spirit, ethos, nature, life, lifeblood, core, heart, centre, crux, nub, nucleus, kernel, marrow, meat, pith, gist, substance, principle, central part, fundamental quality, basic quality, essential part, intrinsic nature, sum and substance, reality, actuality

informal nittygritty.