We use some properties of gamma functions and a summation formula for Kampé de Fériet function $ F_{1:1;1}^{0:3;3} $ to give many double series expansions for $ 1/\pi $ and $ \pi $.
Citation: Long Li. Double series expansions for $ \pi $[J]. AIMS Mathematics, 2021, 6(5): 5000-5007. doi: 10.3934/math.2021294
We use some properties of gamma functions and a summation formula for Kampé de Fériet function $ F_{1:1;1}^{0:3;3} $ to give many double series expansions for $ 1/\pi $ and $ \pi $.
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Long Li. Double series expansions for $ \pi $[J]. AIMS Mathematics, 2021, 6(5): 5000-5007. doi: 10.3934/math.2021294
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