Satadushani is a work written by Vedanta Desika

Vedanta Desika

Vedanta Desika was a Sri Vaishnava Guru. He was a poet, devotee, philosopher and master-teacher...

 who lived in the 12th century. He is considered as one among the most illustrious Acharya

Acharya

In Indian religions and society, an acharya is a guide or instructor in religious matters; founder, or leader of a sect; or a highly learned man or a title affixed to the names of learned men...

 of the Vaishnavite tradition and is the leader of the Vadagalai sect of the Vaishnavas. Though the title of the work suggests hundred refutations, only 66 of them are now available. Satadushani is a work of logic otherwise called as Tarka

Tarka

Tarka can mean:*Tarka, also Chaunk, a common word used in India cuisine to describe the word seasoning*Tarka, Nigeria, a Local Government Area in Benue State, Nigeria*Tarka, Niger*Tarka the Otter, a novel by Henry Williamson...

 in Hindu philosophy. It is a refutation of the nirvesesha Advaita of Sankaracharya. It establishes the validity of the Vishishtadvaita

Vishishtadvaita

Vishishtadvaita Vedanta is a sub-school of the Vedānta school of Hindu philosophy, the other major sub-schools of Vedānta being Advaita, Dvaita, and Achintya-Bheda-Abheda. VishishtAdvaita is a non-dualistic school of Vedanta philosophy...

 philosophy of Ramanuja

Ramanuja

Ramanuja ; traditionally 1017–1137, also known as Ramanujacharya, Ethirajar , Emperumannar, Lakshmana Muni, was a theologian, philosopher, and scriptural exegete...

 as against the Advaita of sankara. It is said that at the age of around 50 or 55 Vedanta Desika was invited by his disciples at Srirangam

Srirangam

Srirangam , Old name is Vellithirumutha gramam and Tamil name is Thiruvarangam , is an island and a part of the city of Tiruchirapalli , in South India....

 to engage in a polemical debate with a group of Advaitins from North India. The arguments made in the form of refutations against these men are said to be the content of this work. The late Surendranath Dasgupta

Surendranath Dasgupta

Surendranath Dasgupta was a scholar of Sanskrit and philosophy.-Family and Education:Dasgupta was born in Kushtia, Bengal . His ancestral home was in the village Goila in Barisal District. He studied in Ripon College Calcutta and graduated with honours in Sanskrit. Later, he received his Masters...

 in his magnum opus 'The history of Indian Philosophy' has allotted almost 40 pages for this particular book of Vedanta Desika in the third volume of the series. The late R. Kesava Aiyangar

R. Kesava Aiyangar

R. Kesava Aiyangar was a Senior Advocate of the Supreme Court of India. He practiced law for over 75 years both at the Supreme Court of India as well as at the High Court of Madras. He was born in 1892 in the Ramanathapuram district of Tamil Nadu in India. He played an important role in the framing...

, a senior advocate of the Supreme Court of India has written an exhaustive introduction to this work in English for the book titled 'Vedanta Desika's Satadushani' by Srivatsankacharya.