Ludolphn.

/ˈluːdɒlf/

Etymology: < the name of Ludolph van Ceulen (1540–1610), who was born at Hildesheim (Germany), taught mathematics in the Netherlands, and calculated π to 35 decimal places.

Ludolph's number: the number π (see pi n.¹).

ΘΚΠ

the world > relative properties > number > mathematical number or quantity > [noun] > infinitesimal > pi

pi1706

Ludolph's number1894

1887 Encycl. Brit. XXII. 434/2 In Germany the ‘Ludolphische Zahl’ is still a common name for the ratio.]

1894 F. Cajori Hist. Math. 154 The value of π is therefore often named ‘Ludolph's number’.

1959 Webster's Biogr. Dict. at Ceulen Ludolph van... Known for computations of the value of π (Ludolphian, or Ludolph's number).

Derivatives

Luˈdolphian adj.

ΘΚΠ

the world > relative properties > number > mathematical number or quantity > [adjective] > prime > irrational

irrational1551

surd1551

radical1557

irradicala1690

ineffable1702

Ludolphian1886

1886 G. S. Carr Synopsis Elem. Results Math. II. Index 901/1 Ludolphian number.

1905 Westm. Gaz. 14 Oct. 3/1 The history of the search for this ratio, the Ludolphian number..is practically the early history of mathematics itself.

1953 H. Eves Introd. Hist. Math. iv. 92 Ludolph van Ceulen of Germany computed π to 35 decimal places by the classical method, using polygons having 2⁶² sides. He spent a large part of his life on this task and his achievement was considered so extraordinary that the number was engraved on his tombstone, and to this day is frequently referred to in Germany as ‘the Ludolphian number’.

This entry has not yet been fully updated (first published 1976; most recently modified version published online March 2018).

单词	ludolph
释义	Ludolphn. /ˈluːdɒlf/ Etymology: < the name of Ludolph van Ceulen (1540–1610), who was born at Hildesheim (Germany), taught mathematics in the Netherlands, and calculated π to 35 decimal places. Ludolph's number: the number π (see pi n.¹). ΘΚΠ the world > relative properties > number > mathematical number or quantity > [noun] > infinitesimal > pi pi1706 Ludolph's number1894 1887 Encycl. Brit. XXII. 434/2 In Germany the ‘Ludolphische Zahl’ is still a common name for the ratio.] 1894 F. Cajori Hist. Math. 154 The value of π is therefore often named ‘Ludolph's number’. 1959 Webster's Biogr. Dict. at Ceulen Ludolph van... Known for computations of the value of π (Ludolphian, or Ludolph's number). Derivatives Luˈdolphian adj. ΘΚΠ the world > relative properties > number > mathematical number or quantity > [adjective] > prime > irrational irrational1551 surd1551 radical1557 irradicala1690 ineffable1702 Ludolphian1886 1886 G. S. Carr Synopsis Elem. Results Math. II. Index 901/1 Ludolphian number. 1905 Westm. Gaz. 14 Oct. 3/1 The history of the search for this ratio, the Ludolphian number..is practically the early history of mathematics itself. 1953 H. Eves Introd. Hist. Math. iv. 92 Ludolph van Ceulen of Germany computed π to 35 decimal places by the classical method, using polygons having 2⁶² sides. He spent a large part of his life on this task and his achievement was considered so extraordinary that the number was engraved on his tombstone, and to this day is frequently referred to in Germany as ‘the Ludolphian number’. This entry has not yet been fully updated (first published 1976; most recently modified version published online March 2018). < n.1886
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