पाटीगणित (श्रीधराचार्य - प्राचीन संस्कृत टीका एवं प्रो. कृपाशंकर शुक्ल सविस्तार व्याख्या)

INTRODUCTION ix
i.e., “The works which were written in the past by Skandasena
and others are very difficult and unintelligible and are
nowhere seen to be in practice now. Therefore, leaving aside
the difficult and out-of-use methods, I shall say the methods
which are in practice even now in their proper sequence.”
The following works written during the eighth and
ninth centuries are also now lost :
(1) The Pâtîgaṇita of Lalla (8th century A.D.)
Quotations from this work occur in Bhâskara II’s
commentary on the Siddhânta-śiromaṇi¹ and in the
Gaṇita-Kaumudî² of Nârâyaṇa (1356 A.D.).
(2) The Siddhânta-tilaka of Lalla (8th century A.D.)
This work was similar to the Brâhma-sphuṭa-siddhânta
of Brahmagupta, and contained chapters on
arithmetic and algebra. Quotations from this
work occur in the commentaries of Râmakṛṣṇa
Ârâdhya (1472 A.D.) and Yallaya (1480 A.D.)
on the Sûrya-siddhânta.
(3) The Govindakṛti of Govinda (9th century A.D.)
This work, written as a sequel to the Âryabhaṭîya of
Âryabhaṭa I, was also similar to the Brâhma-sphuṭa-
siddhânta of Brahmagupta, and contained chapters
on arithmetic and mensuration. Quotations from
this work are found to occur in the commentaries of
Śaṅkaranârâyaṇa (869 A.D.) and Udayadivâkara
(1073 A.D.) on the Laghu-Bhâskarîya of Bhâskara
I, and in Nîlakaṇṭha’s commentary on the Ârya-
bhaṭîya. The author Govinda was a teacher of
Śaṅkaranârâyaṇa.

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¹ Bhuvanakośa, vv. 54-57 (comm.)
² II, p. 175.