PD0021 · conservative definition

QRes

a has a square root modulo m.

Current library: Alpha v34, 4,223 checked-use theorems; Stable remains 432. Historical first admissions, original proof editions, and non-admitted aliases are preserved. Exact original first-admission records.

Readable signature

QRes(m,a)

Exact expansion

exists qr_x_defined_qres. exists qr_u_defined_qres qr_v_defined_qres. qr_x_defined_qres * qr_x_defined_qres + m * qr_u_defined_qres = a + m * qr_v_defined_qres

This node is notation, not a theorem, axiom, predicate constant, or kernel rule. The elaboration layer must expand it before proof checking.

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