線せん形けい微び分ぶん方ほう程てい式しき

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Meanings

linear differential equation

Technical term in mathematics; refers to a differential equation where the unknown function and its derivatives appear linearly.

微び分ぶん方ほう程てい式しき
General term for differential equation; 線形微分方程式 specifies the linear subtype.
非ひ線せん形けい微び分ぶん方ほう程てい式しき
Nonlinear differential equation; contrasts with the linear case.

線せん形けい微び分ぶん方ほう程てい式しき
Standard kanji spelling; 線形 is the modern preferred form for 'linear' in mathematics.
線せん型けい微び分ぶん方ほう程てい式しき
Variant using 型; still seen but less common in modern mathematical writing.

Compound of 線形 (linear) + 微分 (differential) + 方程式 (equation). A straightforward technical term.