I wish to offer condolences to the family, friends, and colleagues of Dr. Takahashi.
Yasushi Takahashi has his own Wikipedia article (though someone who knows him well should update and add to it), which refers to another Wikipedia article on the famous Ward-Takahashi identity that he co-discovered. When I Googled this, I found the astounding number of "About 2,890,000 results," including a YouTube lecture as the second entry. He was certainly a star of our Physics Department and will be sorely missed.
Professor of Physics