"Professor Singh sent his resignation by fax to the President of India, who happens to be the visitor of the University", the varsity's Registrar Professor BP Singh said.

The V-C's resignation comes at a time when non-teaching staff of the University have been on an indefinite strike since July 9 to press for their demands which include regularisation of daily wagers and withdrawal of the proposed move to abolish posts like those of sweepers and gardeners which, the varsity authorities have claimed, was being mooted following instructions received from the UGC.

The resignation comes close on the heels of a group of students staging a demonstration on July 25 outside Professor Singh's residence for several hours in protest against the alleged deteriorating academic environment at the University which was granted Central status in 2005.

On July 26, some BJP MPs had called on the V-C at his residence and were reportedly kept waiting for hours before they were granted an audience.

In 2012, Professor Singh was held hostage inside his residence by students for three days on the issue of vacating hostels.

The matter was resolved only after the intervention of the Allahabad High Court.

An IIT alumnus who had taught Chemistry at a number of prestigious institutions within the country as well as abroad, Professor Singh was appointed the Vice-Chancellor of Allahabad University in January, 2011, becoming the second person to hold the post after the varsity was accorded central status.

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